Learning WPF, CSharp(C#) with me | Part #2

December 6, 2017

Part #2

Subject: Why each trainer stick to console based development when my intention is to learn how to make “real” applications?

Hi guys,

Have you taken a training for development recently? If you are an established developer in any technology stack, the most frustrating thing could be the “basics”, you would groan and stir loads in the seat when a junior trainer goes through the concepts, basic commands set etc & would try to make the logic behind the approach

For example, if you want to learn C#, that you could use Web applications or desktop applications, you have a preset mind that wants to develop the applications those a user could interact with visibly. Not something that open a console and shows you few outputs and closes down.

I have asked the same question to many junior trainers during the courses and none was ever able to give me satisfactory answer. During my last attempt to refresh my C# skills I came to a conclusion towards this irritating question and it is simple like this

A console application when you want to print something on the screen, you just write a code snippet like this

static void Main(){

Console.WriteLine(“Hello World”);

}

And if you want to do the same with a Desktop application, the efforts are like this

You design a form (I will not use the real technical terms here, not at this stage)

You will add textboxes or labels to show “Hello World” (and you don’t really know how to make them at the first level)

Then you will develop the code part that should show the “Hello World” finally when the application starts

So for a trainer it becomes easy to deal with code part, which is the most important element of an application, rather than trying to teach a student the GUI development.

I will try to explain what I have assumed using real examples

Hellow World console application

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace HellowWorldConsole

{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hellow World");
}
}

}

Running the application will open a console window and show you the following

image

Now let us develop the same Hello World application using WPF

My GUI part has the following XAML Code

<Window x:Class="HelloWorldWPF.MainWindow"
xmlns="<a href="http://schemas.microsoft.com/winfx/2006/xaml/presentation"">http://schemas.microsoft.com/winfx/2006/xaml/presentation"</a>
xmlns:x="<a href="http://schemas.microsoft.com/winfx/2006/xaml"">http://schemas.microsoft.com/winfx/2006/xaml"</a>
Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
<Grid>
<TextBox x:Name="HWorld" Margin="95,150,117,124"/>
</Grid>

</Window>

and the code behind is


using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace HelloWorldWPF

{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
this.HWorld.Text = "Hello World";
}
}

}

and the output of both portion is seen as below

image

Now, it’s a common tendency of a seasoned programmer to perfect the GUI, because it creates the initial appeal. As you could see my textbox and the text appearing is not in sync, the height of the textbox is much bigger than the text that it looks somewhat mismatch…the time spent to perfect the GUI could become a real hurdle to progress with the training which must be limited certain hours per course!

Instead the trainers would approach the course, trying to teach the student the maximum coding part, then once the students are familiar with the technology, letting them explore the GUI development (Unless the course has the GUI development exclusively listed under the curriculum)

Once the above idea settled within me comfortably, I managed to sit patiently and learn the “basics” better than ever & was able to map what I learned to GUI much easily. Interested? However, my approach with this series will be developing GUI elements along with the basic coding. Do you have a different approach? do let me know through comments.

with the 1st part of this series I have posted a complete WPF solution to demonstrate what C# with WPF could do. That solution has many issues, like I am not handling folder/file access permissions or threading which is a must requirement when a program is going to run for unprecedented periods.

Be with me and we will be looking at much of them in coming parts.

regards,

rajesh

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Learning WPF, CSharp(C#) with me | Part #1

December 4, 2017

Part #1

Subject: A Simple File Listing Utility using WPF & CSharp (C#)

Okay guys

Here I am once again! This time trying to learn WPF with C# to build my own small utilities to make my “Admin work” a lot easier. Further, I use my own blog as a reference guide most of them time! So, you are most welcome to use my “notes”

A WPF project always has two parts, XAML and the code behind. While XAML maintains the GUI part of it, Code part is where you write supporting code.

<Window x:Class="WpflisttoGrid.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         Title="MainWindow" Height="513" Width="877" Loaded="Window_Loaded">
    <DockPanel>
<Menu DockPanel.Dock="Top" Height="24"></Menu>

        <StatusBar DockPanel.Dock="Bottom" Height="24">
            <StatusBarItem x:Name="StatusItem" Content="Ready" Width="Auto" HorizontalAlignment="Left" VerticalAlignment="top"></StatusBarItem>
        </StatusBar>

        <Grid>
            <GroupBox x:Name="MyParameters">
                <Grid x:Name="MyParameters_Grid">
                    <Label x:Name="lblPath" Content="Folder" HorizontalAlignment="Left" Margin="6,19,0,0" VerticalAlignment="Top"/>
                    <Label x:Name="lblFileType" Content="File Type" HorizontalAlignment="Left" Margin="6,47,0,0" VerticalAlignment="Top"/>
                    <TextBox x:Name="txtPath" HorizontalAlignment="Left" Height="23" Margin="83,22,0,0" TextWrapping="NoWrap" VerticalAlignment="Top" Width="258"/>
                    <TextBox x:Name="txtType" HorizontalAlignment="Left" Height="23" Margin="83,49,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
                    <Button x:Name="buttonFldrOpen" HorizontalAlignment="Left" Margin="346,22,0,0" VerticalAlignment="Top" Height="23" Click="buttonFldrOpen_Click" >
                        <StackPanel Orientation="Horizontal">
                            <Image Source="/Resources/folder_Open_32xMD.png" Stretch="Uniform" Height="18" Width="22"/>
                        </StackPanel>
                    </Button>
                    <Button Content="Process" HorizontalAlignment="Left" Margin="83,84,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
                </Grid>
            </GroupBox>

            <DataGrid x:Name="Grid1" Margin="68,159,89,40" IsReadOnly="True" SelectionChanged="Grid1_SelectionChanged" MouseDoubleClick="Grid1_MouseDoubleClick" SelectionUnit="Cell"/>

        </Grid>

    </DockPanel>

</Window>

and the CSharp code portion as below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
using System.Data;
//Required for folder browswer & so
using System.Windows.Forms;

namespace WpflisttoGrid
{
    ///
<summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            //Setup the gridview to generate columns automatically against the file lists
            this.Grid1.AutoGenerateColumns = true;
            //We will store the text box values into local variables for easy understanding
            //You may refer them straight away as defined columns
            string filepath = this.txtPath.Text;
            string filetype = this.txtType.Text;
            //We will build a LIST of class myFiles
            //Which will have chosen columns from the directory info file info results
            List<myFiles> newList = new List<myFiles>();
            try
            {
                foreach (FileInfo myfile in (new DirectoryInfo(@filepath).GetFiles(filetype, SearchOption.AllDirectories)))
                //SearchOption.TopDirectoryOnly lists files from the top folder, ie, if a folder has sub-folders within
                //SearchOption.TopDirectoryOnly will isolate the top folder & list all files from it
                //SearchOption.AllDirectories will recursively pick all files from all folders those match type of files PDF
                //As a developer who is learning
                //I will leave enhancements to your logic
                //This application could have
                //Files those matching certain "contents"
                //You can change the SearchOption.AllDirectories to SearchOption.TopDirectoryOnly programmatically...etc
                {
                   //Calculate the time difference between the file creation and as on this moment
                    double _fileAge = Math.Round((DateTime.Now - myfile.CreationTime).TotalDays, 0);
                    //Add rows to the new list using new instance of the "Constructor" myFiles by passing the file details
                   newList.Add(new myFiles(myfile.FullName.ToString(), myfile.CreationTime, _fileAge));
                }
                //The following you could use for showing additional details
                //this.StatusItem.Content = myfileList.Count().ToString();
                //this.Grid1.ItemsSource = myfileList;
                //System.Diagnostics.Debug.WriteLine(myfileList.Count());
                this.Grid1.ItemsSource = newList;
                this.Grid1.Columns[0].Header = "File Name";
                this.Grid1.Columns[1].Header = "Creation Time";
                this.Grid1.Columns[2].Header = "File Age(Days)";
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show(ex.Message + ex.Source);
            }
        }

        private void Grid1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

        }
        private void Grid1_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            // System.Windows.MessageBox.Show()
            //https://stackoverflow.com/questions/47309073/c-sharp-wpf-gridview-will-not-show-data-unless-clicked
            try
            {
                var cellInfo = Grid1.SelectedCells[0];
                var content = (cellInfo.Column.GetCellContent(cellInfo.Item) as TextBlock).Text;
                //System.Windows.MessageBox.Show(content);
                System.Diagnostics.Process.Start(@content);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show(ex.Message + ex.Source);
            }
        }

        private void buttonFldrOpen_Click(object sender, RoutedEventArgs e)
        {
            FolderBrowserDialog folderDlg = new FolderBrowserDialog();
            folderDlg.ShowNewFolderButton = false; //Don't allow users to create new folders from this dialogue
            folderDlg.RootFolder = Environment.SpecialFolder.MyComputer;
            // Show the FolderBrowserDialog.
            DialogResult result = folderDlg.ShowDialog();
            if (result == System.Windows.Forms.DialogResult.OK)
            {
                this.txtPath.Text = folderDlg.SelectedPath;
                Environment.SpecialFolder root = folderDlg.RootFolder;
            }
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            this.txtType.Text = "*.*";
        }
    }

    public class myFiles
    {
        public string fName { get; set; }
        public DateTime fCreationDate { get; set; }
        public double fAge { get; set; }

        public myFiles(string fname, DateTime fcdate, double fage)
        {
            fName = fname;
            fCreationDate = fcdate;
            fAge = fage;

        }

    }
}

This project should be used as a pilot to learn both WPF & CSharp (C#) rather than a commercial product as I am not using threading or channeling the background works. So once the Process button clicked, the GUI become irresponsive until the file lists populated, and could make a user feel the system is stuck.

Once the file list is populated in the GridView, one can double click the file name to start a fresh instance of associated program. So be careful, you may be running an executable that could cause unexpected problems.

Optionally you may download the Visual Studio Solution from here

regards,

rajesh


MS SQL Northwind & Pub databases | ‘sp_dboption’

November 6, 2017

Hi guys

Today I am going to upload two SQL scripts using which you could build Northwind & Pub databases against latest versions of MS SQL Server. The latest tested at my end is SQL Server 2014

I have packaged these scripts to avoid the error “Could not find stored procedure ‘sp_dboption’.” error that arises when Microsoft provided SQL scripts are executed against latest database technologies.

You may download the SQL scripts from this link

MD5: 5831113f5ec890986312d2ed532a13e2

SHA-1: 57484de9bea37c5e0b8ba84454e8093612d96df6

regards,

rajesh


C# A folder sync tool

January 26, 2017

Hi guys!

I’ve been busy with so many developments recently. Few projects for Oracle E-Business Suite R12 & few others for learning C#. I can say I’ve “learned” how to copy, paste, correct and use it with my projects to produce beautiful results!

My recent C# projects include a WPF solution that uses WMI classes to generate hardware details for entire Windows Domain (Linux boxes are not dealt) & today I’ve decided to build a small solution that could synchronize my C# projects with our file server.

This small project can,

  • Replicate source Directory, subdirectories & files to destination folder
  • While re-ran, check whether the destination files are older than the source files and, if yes, overwrite the old ones with newer ones.

Interested to try it yourself? here comes the code

(This project uses codes copied from both MSDN & http://www.stackoverflow.com. RecursiveFileProcessor is a MSDN example, while File exists snippet was copied from stackoverflow)

using System;
using System.IO;
using System.Collections;

//http://stackoverflow.com/questions/58744/copy-the-entire-contents-of-a-directory-in-c-sharp
//

namespace RecursiveFileProcessor
{
    class Program
    {
        public static void Main(string[] args)
        {
            string sourceDirectory = @"D:\MyProjects";
            string targetDirectory = @"\\network_share_location\MyProjects";
            Copy(sourceDirectory, targetDirectory);
            Console.WriteLine();
            Console.WriteLine("Task Completed. Press any key to continue");
            Console.ReadLine();

        }

        public static void Copy(string sourceDirectory, string targetDirectory)
        {
            DirectoryInfo diSource = new DirectoryInfo(sourceDirectory);
            DirectoryInfo diTarget = new DirectoryInfo(targetDirectory);

            CopyAll(diSource, diTarget);
        }

        public static void CopyAll(DirectoryInfo source, DirectoryInfo target)
        {

            Directory.CreateDirectory(target.FullName);

            // Copy each file into the new directory.
            foreach (FileInfo fi in source.GetFiles())
            {

                DateTime created = fi.CreationTime;
                DateTime lastmodified = fi.LastWriteTime;

                if (File.Exists(Path.Combine(target.FullName, fi.Name)))
                {
                    string tFileName = Path.Combine(target.FullName, fi.Name);
                    FileInfo f2 = new FileInfo(tFileName);
                    DateTime lm = f2.LastWriteTime;
                    Console.WriteLine(@"File {0}\{1} Already Exist {2} last modified {3}", target.FullName, fi.Name, tFileName, lm);

                    try
                    {
                        if (lastmodified > lm)
                        {
                            Console.WriteLine(@"Source file {0}\{1} last modified {2} is newer than the target file {3}\{4} last modified {5}",
                                fi.DirectoryName, fi.Name, lastmodified.ToString(), target.FullName, fi.Name, lm.ToString());
                            fi.CopyTo(Path.Combine(target.FullName, fi.Name), true);
                        }
                        else
                        {
                            Console.WriteLine(@"Destination File {0}\{1} Skipped", target.FullName, fi.Name);
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }

                }
                else
                {
                    Console.WriteLine(@"Copying {0}\{1}", target.FullName, fi.Name);
                    fi.CopyTo(Path.Combine(target.FullName, fi.Name), true);
                }

            }

            // Copy each subdirectory using recursion.
            foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
            {
                DirectoryInfo nextTargetSubDir =
                    target.CreateSubdirectory(diSourceSubDir.Name);
                CopyAll(diSourceSubDir, nextTargetSubDir);
            }
        }

    }
}

Thumb rules:

  1. Do not set your source and destination folders the same.

This project uses Framework 4.5 & I am sure versions above 2.0 should support the classes referred.

If you are new to .net developments, create a project with the name “RecursiveFileProcessor”, which will let you copy and paste the whole code as it is to your project.

Do let me know whether you enjoyed your new sync toy!

regards,

rajesh


C# (CSharp, C-Sharp) Windows Active Directory last logon

January 7, 2017

Hi guys

Please note, many threads were referred in order to compile the script attached below & all I did was re-arranging in order for better reading/formatting

(And I insure that the script works under following scenarios:

  1. You are a domain administrator
  2. You are administrating Windows 2003 onwards Windows domain
  3. Your puter is connected to the domain network ;)

)

Referenced websites/threads

  1. http://stackoverflow.com/questions/15775264/searching-for-lastlogon-attribute-of-user-in-multiple-domain-servers
  2. https://www.codeproject.com/kb/security/lastlogonacrossallwindows.aspx#_comments
  3. http://codebeautify.org/csharpviewer (for formatting the C# code)

How to test the code

Start Visual Studio (I am using 2013 Professional edition, you can use any of the community editions to test the scripts)

Create a new C# Console Application and name it llogon (else you need to change the namespace name “llogon” according to the name you have chosen for your new project.

Add the following references to your project

  1. “Framework -> System.DirectoryServices”
  2. “Browse and add -> C:\Windows\System32\activeds.tlb”

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

//Added by Rajesh

//using System.Management;
//using System.Data;
using System.DirectoryServices;
using System.DirectoryServices.ActiveDirectory;
//http://stackoverflow.com/questions/33274162/the-namespace-of-iadslargeinteger
//ActiveDS namespace
using ActiveDs; // Namespace added via ref to C:\Windows\System32\activeds.tlb
//https://www.codeproject.com/kb/security/lastlogonacrossallwindows.aspx

namespace llogon
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get the root entry
            DirectoryEntry rootDSE = new DirectoryEntry("LDAP://RootDSE");
            string configurationNamingContext =
             (string)rootDSE.Properties["configurationNamingContext"].Value;
            string defaultNamingContext =
             (string)rootDSE.Properties["defaultNamingContext"].Value;
            Dictionary<string, Int64> lastLogons = new Dictionary<string, Int64>();
            // Get all the domain controllers
            DirectoryEntry deConfig = new DirectoryEntry("LDAP://" + configurationNamingContext);
            DirectorySearcher dsConfig = new DirectorySearcher(deConfig);
            dsConfig.Filter = "(objectClass=nTDSDSA)";
            foreach (SearchResult srDomains in dsConfig.FindAll())
            {
                DirectoryEntry deDomain = srDomains.GetDirectoryEntry();
                if (deDomain != null)
                {
                    string dnsHostName =
                     deDomain.Parent.Properties["DNSHostName"].Value.ToString();
                    // Get all the users for that domain
                                   DirectoryEntry deUsers =
                     new DirectoryEntry("LDAP://" + dnsHostName + "/" + defaultNamingContext);
                    DirectorySearcher dsUsers = new DirectorySearcher(deUsers);
                    dsUsers.Filter = "(&(objectCategory=person)(objectClass=user))";
                    foreach (SearchResult srUsers in dsUsers.FindAll())
                    {
                        DirectoryEntry deUser = srUsers.GetDirectoryEntry();
                        if (deUser != null)
                        {
                            // Get the distinguishedName and lastLogon for each user
                            // Save the most recent logon for each user in a Dictionary object
                            string distinguishedName = deUser.Properties["distinguishedName"].Value.ToString();
                            Int64 lastLogonThisServer = new Int64();
                            if (deUser.Properties["lastLogon"].Value != null)
                            {
                                IADsLargeInteger lgInt =
                                 (IADsLargeInteger)deUser.Properties["lastLogon"].Value;
                                lastLogonThisServer = ((long)lgInt.HighPart << 32) + lgInt.LowPart;
                            }

                            // Save the most recent logon for each user in a Dictionary object
                            if (lastLogons.ContainsKey(distinguishedName))
                            {
                                if (lastLogons[distinguishedName] < lastLogonThisServer)
                                {
                                    lastLogons[distinguishedName] = lastLogonThisServer;
                                }
                            }
                            else
                            {
                                lastLogons.Add(distinguishedName, lastLogonThisServer);
                            }
                            string readableLastLogon = DateTime.FromFileTime(lastLogonThisServer).ToString();
                            Console.WriteLine("User: " + distinguishedName + "Last logon: " +readableLastLogon);
                        }
                    }
                    Console.ReadLine();
                }
            }

        }
    }
}

Try the code & if you are stuck somewhere, do let me through the comments. I am working on a WPF C# project for a simple Active Directory Reporter / Asset Management System using WMI. Stay tuned & I will soon post the entire solution here :)

regards,

rajesh

 


ASP.Net | Learn the basics of developing your first website using VB.Net or C#

March 8, 2015

You are here, seeking some information and we are more than happy to re-direct you to http://webproject.scottgu.com, a right place to start learning how to develop a website using Visual Studio IDE. Though the posts with scottgu.com mostly deal with VS 2005, almost everything they mentioned with their lessons are still applicable to the latest VS releases.
So give it a try, and you will be more than glad to visit one of the best beginners place.

regards,

rajesh


Visual Studio 2013 | HRESULT 0x80070002 exception

March 2, 2015

Scenario

A brand new installation of Visual Studio 2013

You are trying to create a new project/solution and immediately after choosing the type of the application (eg: Single page web application) an error raised saying referenced file cannot be found, followed by the error code HRESULT 0x80070002

Solution

Go to http://docs.nuget.org/consume/installing-nugget

Select the build of your Visual Studio NuGet client and move to the download page

Download the package (After closing down the Visual Studio, if yet open) and install the package

Restart Visual Studio and the error must have been gone by now.

Happy Programming guys ;)

regards,

rajesh