Question

I have this code to show/hide Canvas with some text boxes, and when I press a button it submits data from TextBox1 to database. The problem is that I don’t know how to access TextBox1 in C# code behind.

For example this is some of my XAML code:

<ContentControl  Background="{x:Null}" >
  <ContentControl.Template>
     <ControlTemplate>
      <StackPanel Grid.Row="3" Height="500" Name="stack1" Width="280">
        <Canvas x:Name="canvas1"  Height="400" >
              <TextBox Height="23" Name="TextBox1"  Width="70" />

    <Button Content="Submit" Name="submit_button" Click="submit_button_Click" />
        </Canvas>

  <ToggleButton x:Name="toggleshowhide" Content="Show/Hide" IsChecked="True" Height="50" />
      </StackPanel>
     <ControlTemplate.Triggers>
      <Trigger SourceName="toggleshowhide" Property="IsChecked" Value="True">
        <Setter TargetName="canvas1" Property="Visibility" Value="Visible" />
          </Trigger>
      <Trigger SourceName="toggleshowhide" Property="IsChecked" Value="False">
        <Setter TargetName="canvas1" Property="Visibility" Value="Hidden" />
          </Trigger>
    </ControlTemplate.Triggers>
      </ControlTemplate>
  </ContentControl.Template>
     <Button Content="Button" Height="23" Name="submit" Width="74" />
</ContentControl>

And this is what I’m trying to achieve:

private void submit_button_Click(object sender, RoutedEventArgs e)
{
      OleDbCommand cmd = new OleDbCommand("INSERT INTO Table VALUES (this.TextBox1.Text), con); 

      cmd.Connection = con;

         int temp = cmd.ExecuteNonQuery();

        if (temp > 0)
        {
            MessageBox.Show("OK", "Info !");
        }
        else
        {
            MessageBox.Show("Some text !", "Error");
        }

If anyone can help I`ll really appreciate it. 🙂

Answer 1

When accessing elements generated from a ControlTemplate, you need to use the FindName method of the Template. In this case, give your ContnetControl a name:

<ContentControl  Background="{x:Null}" x:Name="MyContentControl">

And in the code behind, you can access the value of any of the generated elements by name using the FindName method:

TextBox tb = (TextBox)MyContentControl.Template.FindName( "TextBox1", MyContentControl);

For more information, see: How to: Find ControlTemplate-Generated Elements