This was because .NET detected something in the entered text which looked like an HTML statement.
This is a feature put in place to protect your application cross site scripting attack and followed accordingly.
To disable request validation, I added the following to the existing “page” directive in that .aspx file.
ValidateRequest="false"
For .NET 4, we need to add requestValidationMode=”2.0″ to the httpRuntime configuration section of the web.config file like the following:
<httpRuntime requestValidationMode="2.0"/>
But if there is no httpRuntime section in the web.config file, then this goes inside the <system.web> section.
If anyone wants to turn off request validation for globally user, the following line in the web.config file within <system.web> section:
<pages validateRequest="false" />
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