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What Are xmlns and xmlns:x in WPF? Understanding XML Namespace Declarations

In WPF (Windows Presentation Foundation), xmlns and xmlns:x are XML namespace declarations used in XAML files. They define the scope of XML namespaces, which are used to distinguish between elements and attributes that might have the same name but are used in different contexts. xmlns : The Default XML Namespace Definition : xmlns stands for XML namespace. It is used to declare the default namespace for the elements in the XAML file. Purpose : In WPF, it typically maps to the .NET namespaces that contain the classes and controls used in WPF applications. This default namespace allows you to use the WPF controls and elements without prefixing them. Example : <Window x:Class="WpfApp.MainWindow"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    ... > <Grid>        <Button Content="Click Me"/>     </Grid> </Window> Here, xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" sets...
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How to create TextBox in wpf that does not accept number using MVVM?

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Method 1: Using Model Property Inside View <TextBox Width="200" Text="{Binding MainWindowModel.NonNumeric,UpdateSourceTrigger=PropertyChanged}"> Inside Model  private string _nonNumeric;         public string NonNumeric         {             get { return _nonNumeric; }             set             {                 int intvalue;                 if (!int.TryParse(value[value.Length - 1].ToString(), out intvalue))                     SetProperty(ref _nonNumeric, value);                 else                     value = _nonNumeric;             }         } M...
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How to create Own Semaphore?

 class CustomSemaphore     {         private Mutex[] arrMutex;         // place holder to store thread to mutex mapping         private Thread[] arrthread;         // number of threads allowed to access the resources         private int threadLimit;         // contructor creates the mutexes         public CustomSemaphore(int threadLimit)         {             this.threadLimit = threadLimit;             arrMutex = new Mutex[this.threadLimit];             arrthread = new Thread[this.threadLimit];             for (int i = 0; i < this.threadLimit; i++)             {                 arrMutex[i] = new Mutex()...
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Write a method for division of two number without using division (‘/’) operator in C#.

    void DivideWithoutDivisionOperator(int divident,int divisior)         {             int quotient = 0;             bool isNegative = false;             if (divident < 0)//if negative             {                 divident = -divident;//make positive                 if (divisior < 0)//if negative                     divisior = -divisior;//make positive                 else                     isNegative = true;             }             else if (divisior < 0)//if negative             {      ...
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