How to allow only numbers, characters in the textbox using FilteredTextBoxExtender control of Ajax,

Introduction: In previous articles i explained How to install Ajax Control Toolkit in Visual Studio and Ajax AutoCompleteExtender control example in using C#,VB.Net without using web service and Ajax AutoCompleteExtender control example in C#,VB.Net using web service and CalendarExtendar control of Ajax in working on application we may need to create a user input form where user fills a form having different type of input boxes. In this case we have to restrict user to enter only valid data in the form. We can handle this through FilteredTextBoxExtender control of AJAX.

Steps are as follows:

-->Download and install ajax toolkit to Visual Studio from
-->add reference to ajaxcontroltoolkit.dll
-->place a script manager on the design page
-->add FilteredTextBoxExtender by clicking on the textbox and then as follows:

1) Allowing only "Numbers"
   <asp:TextBox ID="txtMob" runat="server"></asp:TextBox>
                <asp:FilteredTextBoxExtender ID="txtMob_FilteredTextBoxExtender" runat="server"
                    Enabled="True" TargetControlID="txtMob" FilterType="Custom" FilterMode="ValidChars" ValidChars="0123456789">

2) Allowing only "numbers and hiphen sign"
  <asp:TextBox ID="txtPhone" runat="server"></asp:TextBox>
                <asp:FilteredTextBoxExtender ID="txtPhone_FilteredTextBoxExtender"
                    runat="server" Enabled="True" TargetControlID="txtPhone" FilterType="Custom" FilterMode="ValidChars" ValidChars="0123456789-">

3) Allowing only "Characters and space"

 <asp:TextBox ID="txtName" runat="server" ></asp:TextBox>
                <asp:FilteredTextBoxExtender ID="txtName_FilteredTextBoxExtender"
                    runat="server" Enabled="True" TargetControlID="txtName"  FilterType="Custom,LowercaseLetters,UppercaseLetters" FilterMode="ValidChars"  ValidChars=" ">
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