How do I solve this problem

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Compiler Error Message: CS1061: 'ASP.registration_aspx' does not contain a definition for 'DropDownList1_SelectedIndexChanged1' and no extension method 'DropDownList1_SelectedIndexChanged1' accepting a first argument of type 'ASP.registration_aspx' could be found (are you missing a using directive or an assembly reference?)
thats the error i receive on my login registration form kindly help me to sort out the problem

What I have tried:

C#

yes several time but all in vain

Posted 8-Aug-20 21:07pm

Member 14910143

Updated 9-Aug-20 4:25am

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Perić Željko 9-Aug-20 4:42am

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/compiler-messages/cs1061

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OriginalGriff · Answer 1 · 2020-08-08T21:17:00

Solution 1

Read the message: there is no method in your class that has that name and signature. Check you added it to the right file, and that it is both in the correct class inside that file, and that the signature is right.

Sorry, but we can't do that for you - we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.

Posted 8-Aug-20 21:17pm

OriginalGriff

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Member 14910143 9-Aug-20 3:36am

please am unable to exactly get the error ..have reconstructed but still gets the same error

OriginalGriff 9-Aug-20 4:09am

Show us the relevant code fragments - we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
Use the "Improve question" widget to edit your question and provide better information.

F-ES Sitecore · Answer 2 · 2020-08-09T04:25:00

If you have a dropdown like

<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged1" />

then you need a method in your code-behind with the exact name as it appears in the OnSelectedIndexChanged attribute

protected void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e)
{

}

Note there is a "1" at the end of your function name so make sure the aspx and code-behind match exactly. Also make sure the method is "protected" or "public", not "private" or left default like

void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e)
{

}