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Use the Grid to create a dialog box that uses the WPF layout API

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="Grid_Run_Dialog.Window1"     Name="mainWindow" Loaded="onLoaded" Width="425" Height="200"/> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Media; namespace Grid_Run_Dialog {   public partial class Window1 : Window   {     Grid grid1 = new Grid ();     ColumnDefinition colDef1 = new ColumnDefinition();     ColumnDefinition colDef2  = new ColumnDefinition();     ColumnDefinition colDef3 = new ColumnDefinition();     ColumnDefinition colDef4 = new ColumnDefinition();     ColumnDefinition colDef5 = new ColumnDefinition();     RowDefinition rowDef1= new RowDefinition();     RowDefinition rowDef2= new RowDefinition();     RowDefinition rowDef3= new RowDefinition();     RowDefinition rowDef4= new RowDefinition();     TextBlock txt1 = new TextBlock();     TextBlock txt2 = new TextBlock();     Button button1= new Button();     Button button2= new Button();     Button button3= new Button();     TextBox tb1;     Image img1 = new Image();         void onLoaded(object sender, EventArgs e)     {             grid1.Background = Brushes.Gainsboro;             grid1.HorizontalAlignment = HorizontalAlignment.Left;             grid1.VerticalAlignment = VerticalAlignment.Top;             grid1.ShowGridLines = true;             grid1.Width = 425;             grid1.Height = 165;             colDef1.Width = new GridLength(1, GridUnitType.Auto);             colDef2.Width = new GridLength(1, GridUnitType.Star);             colDef3.Width = new GridLength(1, GridUnitType.Star);             colDef4.Width = new GridLength(1, GridUnitType.Star);             colDef5.Width = new GridLength(1, GridUnitType.Star);             grid1.ColumnDefinitions.Add(colDef1);             grid1.ColumnDefinitions.Add(colDef2);             grid1.ColumnDefinitions.Add(colDef3);             grid1.ColumnDefinitions.Add(colDef4);             grid1.ColumnDefinitions.Add(colDef5);             rowDef1.Height = new GridLength(1, GridUnitType.Auto);             rowDef2.Height = new GridLength(1, GridUnitType.Auto);             rowDef3.Height = new GridLength(1, GridUnitType.Star);             rowDef4.Height = new GridLength(1, GridUnitType.Auto);             grid1.RowDefinitions.Add(rowDef1);             grid1.RowDefinitions.Add(rowDef2);             grid1.RowDefinitions.Add(rowDef3);             grid1.RowDefinitions.Add(rowDef4);             img1.Source = new System.Windows.Media.Imaging.BitmapImage(new Uri("fil:///c:/image.png", UriKind.Relative));             Grid.SetRow(img1, 0);             Grid.SetColumn(img1, 0);             txt1.Text = "Text";             txt1.TextWrapping = TextWrapping.Wrap;             Grid.SetColumnSpan(txt1, 4);             Grid.SetRow(txt1, 0);             Grid.SetColumn(txt1, 1);             txt2.Text = "Open:";             Grid.SetRow(txt2, 1);             Grid.SetColumn(txt2, 0);                          Grid.SetRow(tb1, 1);             Grid.SetColumn(tb1, 1);             Grid.SetColumnSpan(tb1, 5);                          button1.Content = "OK";             button2.Content = "Cancel";             button3.Content = "Browse ...";             Grid.SetRow(button1, 3);             Grid.SetColumn(button1, 2);             button1.Margin = new Thickness(10, 0, 10, 15);             button2.Margin = new Thickness(10, 0, 10, 15);             button3.Margin = new Thickness(10, 0, 10, 15);             Grid.SetRow(button2, 3);             Grid.SetColumn(button2, 3);             Grid.SetRow(button3, 3);             Grid.SetColumn(button3, 4);                          grid1.Children.Add(img1);             grid1.Children.Add(txt1);             grid1.Children.Add(txt2);             grid1.Children.Add(tb1);             grid1.Children.Add(button1);             grid1.Children.Add(button2);             grid1.Children.Add(button3);                          mainWindow.Content = grid1;         }     } }