how to Filtered TextBox Using FilteredTextBoxExtender

 

Default.aspx

 <cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
 </cc1:ToolkitScriptManager>


 <asp:TextBox ID="txtUppercase" runat="server" Height="30px" Width="210px"></asp:TextBox>
 <asp:TextBox ID="txtLowercase" runat="server" Height="30px" Width="210px"></asp:TextBox>
 <asp:TextBox ID="txtNumber"     runat="server" Height="30px" Width="210px"></asp:TextBox>
       
 <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1"
          runat="server" FilterType="UppercaseLetters"
          TargetControlID="txtUppercase">
 </cc1:FilteredTextBoxExtender>
       
 <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender2"
          runat="server" FilterType="LowercaseLetters"
          TargetControlID="txtLowercase">
 </cc1:FilteredTextBoxExtender>
       
  <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender3"
           runat="server" FilterType="Numbers"
           TargetControlID="txtNumber">
  </cc1:FilteredTextBoxExtender>