error in visual web devloper

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C#

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'ASP.main_aspx' does not contain a definition for 'Button1_Click' and no extension method 'Button1_Click' accepting a first argument of type 'ASP.main_aspx' could be found (are you missing a using directive or an assembly reference?)

Source Error:



Line 17: <p>
Line 18: &nbsp;&nbsp;&nbsp;&nbsp;
Line 19: <asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Line 20: style="height: 26px" Text="ok" />
Line 21: <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>