are you trying to implement the JS validation functions in asp.net application? If Yes, try this one.. use the Js function in the section function CheckValidation() { if (document.getElementById('<%=txtString.ClientID %>').value == '') { Msg = "Enter string..! \n" } } and use the method in the asp.net textbox control as follows:

If you have a good understanding of ASP.NET and SQL Server then SharePoint will be easy for you. Buy some good books and start working on the same. There is no foolish question, there is no final answer...