page 'analysis_aspx' does not contain a definition for 'Button1_Click' and no extension method 'Button1_Click

Question

this is my error CS1061: 'analysis_aspx' does not contain a definition for 'Button1_Click' and no extension method 'Button1_Click' accepting a first argument of type 'analysis_aspx' could be found (are you missing a using directive or an assembly reference?)

my code in aspx file:

<asp:Button ID="Button1" CssClass="btn" runat="server" Text="Happy" Font-Bold="True" Font-Size="Medium" Height="40px" Width="100px" OnClick="Button1_Click" />

i have 3 buttons like this.

my codebehind that is .cs file is

protected void Button1_Click(object sender, EventArgs e)

i have seen some related questions but in most questions they are missing something so they got the error but for me i don,t know why i am getting this error .

someone can show me the right direction. Thanks In Advance

Answer 1

I had a similar issue , i changed all Button naming to new button say button1 to button2 and build and ran it worked. it may be looking at the same button 1 in another page ?

Answer 2

Try to delete that button. Clean and rebuild the code. Add a new button again. This should resolve the issue.

Answer 3

Please check if the button is added to the designer file of the aspx. This problem happens when the designer file is not refreshed.