Text of Text Box Based on twoComboBox Item in WPF

Question

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I have a Two ComboBox in my application in which ComboBoxItems are "Yes" and "No".

I want to assign the text of my TextBox as "cleared" if the selected ComboBoxItem is "Yes" in both the combobox and "not cleared" if the selected ComboBoxItem is "No" in both or "yes" in one or "No" in other ComboBox How do I do that in WPF?
I have Done this way but its not working accuretly

XML

in my Xaml

<ComboBox Height="17" HorizontalAlignment="Left" IsEditable="False" IsReadOnly="False" Margin="297,103,0,0" Name="comboBox1" VerticalAlignment="Top" Width="101" SelectionChanged="comboBox1_SelectionChanged"/>
<ComboBox Height="17" HorizontalAlignment="Left" IsEditable="False" IsReadOnly="False" Margin="297,120,0,0" Name="comboBox2" VerticalAlignment="Top" Width="101" SelectionChanged="comboBox2_SelectionChanged"/>
<TextBox Height="19" HorizontalAlignment="Left" Margin="297,0,0,54" Name="textBox32" VerticalAlignment="Bottom" Width="101"  />

C#

Into my Xmal.Cs


{
            InitializeComponent();
            comboBox1.Items.Add("Yes");
            comboBox1.Items.Add("No");
            comboBox2.Items.Add("Yes");
            comboBox2.Items.Add("No");
}
private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            {
                textBox32.Text = (comboBox1.SelectedItem != null && comboBox1.SelectedItem.ToString() == "Yes") ?
                    "cleared" :

                    "not cleared";
            }
        }

        private void comboBox2_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            {
                textBox32.Text = (comboBox2.SelectedItem != null && comboBox2.SelectedItem.ToString() == "Yes" ) ?
                    "cleared" :
                    "not cleared";
            }
        }

Posted 11-Feb-11 23:19pm

amitkarnik2211

Updated 12-Feb-11 0:01am

TweakBird

v3

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Nish Nishant · Accepted Answer · 2011-02-12T03:34:00

WPF has such powerful binding capabilities that you should not have to handle control events as you do above. Here's a quickly put together example that shows you what you can do (please keep in mind that I have not done too much error checking, case-insensitive compare etc. - the code is just an example for you):

XML

<ComboBox ItemsSource="{Binding Strings}" SelectedItem="{Binding Combo1String}"
    Height="23" HorizontalAlignment="Left" Margin="36,35,0,0"
    Name="comboBox1" VerticalAlignment="Top" Width="120" />
<ComboBox ItemsSource="{Binding Strings}" SelectedItem="{Binding Combo2String}"
    Height="23" HorizontalAlignment="Left" Margin="202,35,0,0"
    Name="comboBox2" VerticalAlignment="Top" Width="120" />
<TextBox Text="{Binding Status}"
    Height="23" HorizontalAlignment="Left" Margin="42,90,0,0"
    Name="textBox1" VerticalAlignment="Top" Width="257" />

C#

public MainWindow()
{
  InitializeComponent();

  this.Strings = new[] { "yes", "no" };
  this.PropertyChanged += MainWindow_PropertyChanged;
}

void MainWindow_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
  if (e.PropertyName.StartsWith("Combo"))
  {
      if (this.Combo1String == "yes" & this.Combo1String == this.Combo2String)
      {
          this.Status = "Cleared";
      }
      else
      {
          this.Status = "Not cleared";
      }
  }
}

public string[] Strings { get; set; }

private string combo1String;

public string Combo1String
{
  get { return combo1String; }

  set
  {
      if (combo1String != value)
      {
          combo1String = value;
          this.FirePropertyChanged("Combo1String");
      }
  }
}

private string combo2String;

public string Combo2String
{
  get { return combo2String; }

  set
  {
      if (combo2String != value)
      {
          combo2String = value;
          this.FirePropertyChanged("Combo2String");
      }
  }
}

private string status;

public string Status
{
  get { return status; }

  set
  {
      if(status != value)
      {
          status = value;
          this.FirePropertyChanged("Status");
      }
  }
}

[Edit]
~~~~~~~

In response to your comment, you need to implement INotifyPropertyChanged. That's an absolute requirement for MVVM approaches.