Asp.net Error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500

PROBLEM:
You are developing web site using ASP.NET. You get the flowing error when running your site "Asp.net Error: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500"

SOLUTION:
Remove the characters '<' or '>' from your controls bound data

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