Web Forms :: Element UpdatePanel Is Not Known Element

Apr 4, 2013

Element 'ScriptManager' is not a known element. This can occur if there is a compilation error in the Web site. 

 Element 'UpdatePanel' is not a known element. This can occur if there is a compilation error in the Web site.

tried many thingschecked web config filereinstalled ajaxtoolkit

but nothing is working

getting error in the whole projectalong with this getting error for other asp,net controls also

Element 'TextBox' is not a known element. This can occur if there is a compilation error in the Web site.

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