xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="WpfApplication1.Window1" Title="ColumnDefinitions Sample"> Grid Column and Row Collections How Many Columns? //File:Window.xaml.csusing System;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;namespace WpfApplication1{ public partial class Window1 : Window { RowDefinition rowDef1; ColumnDefinition colDef1; private void colCount(object sender, RoutedEventArgs e) { Console.WriteLine("The current number of Columns is: " + grid1.ColumnDefinitions.Count); } }}