asp.net - validation control -

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i've regular expression validation accept aphabets only. not accepting user input data...

use re control : 

 <asp:regularexpressionvalidator id="regularexpressionvalidator1" runat="server" errormessage="please input alphabets." controltovalidate="txtinput" validationexpression="^[a-za-z]+$" height="19px" width="165px"></asp:regularexpressionvalidator>

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