Numeric TextBox (ASP.Net / HTML Input)
< script language ="javascript"> function KeyCheck(e) { var KeyID = (window. event ) ? event .keyCode : e.which; if ((KeyID >= 65 && KeyID <= 90) || (KeyID >= 97 && KeyID <= 122) || (KeyID >= 33 && KeyID <= 47) || (KeyID >= 58 && KeyID <= 64) || (KeyID >= 91 && KeyID <= 96) || (KeyID >= 123 && KeyID <= 126)) { return false ; } return true ; } </ script > HTML Text Box < input type ="text" ID ="txt_TextBox" onkeypress ="return KeyCheck(event);" runat ="server" style ="width: 28px" /> ASP.Net TextBox < asp : TextBox ID ="txt_ASPTextBox" runat ="server" ></ asp : TextBox > Code Behind for Asp.Net TextBox txt_ASPTextBox.Attributes.Add( "onkeypress","return KeyCheck(event);" );