"ELEMENT 'Textbox' is not a known element This may occur if there is a compilation error or web.config is missing"

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please help ... there is green line under all control and appear errors while running

Posted 31-Dec-14 9:47am

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-12-31T10:28:00

ASP.NET elements and attributes are case-sensitive, because the ASP.NET markup language is based on XML, should well-formed:
http://msdn.microsoft.com/en-us/library/w7w4sb0w%28v=vs.140%29.aspx[^].

It's <asp:TextBox .../>, not <asp:Textbox .../>:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox%28v=vs.110%29.aspx[^].

—SA