need validator in that only accept letters in the alphabet

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how can i accomplish this?
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<asp:TextBox ID="txtTestValue" runat="server"  />
<asp:regularexpressionvalidator id="regValAlphaOnly"   runat="server"
            errormessage="Only Alpha Characters" ControlToValidate="txtTestValue"
            ValidationExpression="[a-zA-Z]+"  />

thanks for the points.

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