If you face such above mentioned error on inserting a value then that value might be containing anchor tags(< or >). If you want to insert these values you have to write

ValidateRequest="false" in page directive (first line of .aspx file)


Example:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="xyx.aspx.cs" Inherits="xyz" ValidateRequest="false" %>

Write following statement in Query Window

SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY ('productlevel'), SERVERPROPERTY ('edition')



* The product version (10.0.1600.24)
* The product level (RTM)
* The edition (Enterprise)

Inorder to find out version of sql server write the following statements in query window

SELECT @@VERSION