Allow only certain characters in textbox in asp.net

TargetControlID:give your textbox id

ValidChars:which characters, we need to  allow in text box ,there are given like this ValidChars=”1234567890ar.”

Example:

<asp:TextBox ID=”txtamt” runat=”server”AutoPostBack=”True”></asp:TextBox>

<cc1:FilteredTextBoxExtender ID=”FTEamt” runat=”server” TargetControlID=”txtamt” ValidChars=”1234567890.”>  </cc1:FilteredTextBoxExtender>

*Note:FilteredTextBoxExtender is an Ajax control