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    <p>I don't know what is the best solution for you. One of these ,however, would be that you use Property like:</p> <pre><code> //field private int _dependOne; //property public int DependOne { get { return _dependOne; } set { _dependOne = value; Count += value; } } //Finally, use the property instead of the field //dependOne = dependOne + 2; DependOne += 2; </code></pre> <hr> <p><strong>UPDATED:</strong> The important thing is that you don't update ViewModel properties in Codebehind. Instead, you could call a ViewModel method.</p> <p><strong>XAML</strong></p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Local="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"&gt; &lt;StackPanel&gt; &lt;StackPanel.Resources&gt; &lt;Local:MyConverter x:Key="myConverter"/&gt; &lt;/StackPanel.Resources&gt; &lt;TextBox&gt; &lt;TextBox.Text&gt; &lt;MultiBinding Converter="{StaticResource myConverter}"&gt; &lt;Binding Path="DependOne" Mode="OneWay"/&gt; &lt;Binding Path="DependTwo" Mode="OneWay"/&gt; &lt;/MultiBinding&gt; &lt;/TextBox.Text&gt; &lt;/TextBox&gt; &lt;Button Click="button1_Click"&gt;click&lt;/Button&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p><strong>CODE</strong></p> <pre><code>public partial class MainWindow : Window { ViewModel vm; public MainWindow() { InitializeComponent(); vm = new ViewModel(); this.DataContext = vm; } //public int Count //{ // get { return (int)GetValue(CountProperty); } // set { SetValue(CountProperty, value); } //} //// Using a DependencyProperty as the backing store for Count. This enables animation, styling, binding, etc... //public static readonly DependencyProperty CountProperty = // DependencyProperty.Register("Count", typeof(int), typeof(MainWindow), new UIPropertyMetadata(12)); private void button1_Click(object sender, RoutedEventArgs e) { vm.UpdateCount(); } } public class ViewModel : INotifyPropertyChanged { public ViewModel() { } private int dependOne = 0; public int DependOne { get { return dependOne; } set { dependOne = value; OnPropertyChanged("DependOne"); } } private int dependTwo = 0; public int DependTwo { get { return dependTwo; } set { dependTwo = value; OnPropertyChanged("DependTwo"); } } #region -- INotifyPropertyChanged Members -- public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string propertyNameArg) { PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(propertyNameArg)); } } #endregion internal void UpdateCount() { DependOne = 3; DependTwo = 4; } } public class MyConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { var dependOne = (int)values[0]; var dependTwo = (int)values[1]; return (dependOne + dependTwo).ToString(); } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new NotSupportedException(); } } </code></pre>
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    1. USJin-Wook Chung
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    1. COya this one also makes sence......
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      1. USAryan SuryaWansi
    2. COYes, it's the simple one... As not knowing your actual situation, I just said this, but I think @Merlyn Morgan-Graham is good point. Also, you can consider making the dependOne as `DependecnyProperty` if the dependOne acts on View. Then, use `Value Changed Callback` to update the Count.
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    3. COThanks for answering ..but.. ,,as per the Graham's answer.....where we have to put expression...`Count = dependOne + dependTwo; `
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      1. USAryan SuryaWansi
 

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