Introduction

In this Blog you will see how to create user control for upper case textbox

Step 1

Add class1.cs to your current project as UC_UpperCase_TextBox

Add Class

Figure 1:Add Class

Step 2

Inherit this class with textbox like

public class UC_UpperCase_TextBox : TextBox

Step 3

Create TextChanged Event for this control

  1. public UC_UpperCase_TextBox()
  2. {
  3. this.TextChanged += new TextChangedEventHandler(UC_UpperCase_TextBox_TextChanged);
  4. }
Step 4

Inside TextChanged event put code for convert text in Upper Case
  1. void UC_UpperCase_TextBox_TextChanged(object sender, TextChangedEventArgs e)
  2. {
  3. var tb = (TextBox) sender;
  4. var selectionStart = tb.SelectionStart;
  5. var selectionLength = tb.SelectionLength;
  6. tb.Text = tb.Text.ToUpper();
  7. tb.SelectionStart = selectionStart;
  8. tb.SelectionLength = selectionLength;
  9. }
Your code will Look Like :

Code

Figure 2: Code

Step 5

You can use it as a control in .xaml like:
  1. <my2:UC_UpperCase_TextBox Grid.Row="1" Grid.Column="1" Margin="2,3" Height="23" Text="{Binding TITLE,Mode=TwoWay}" HorizontalAlignment="Stretch" VerticalAlignment="Center" x:Name="txt_Title" MaxLength="1024" />
It can be use in WPF and Silverlight Application to make it Upper case Letter in text box.