What cause and how to solve this problem

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Compiler Error Message: CS0433: The type 'proto.Class1' exists in both

what could the problem

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="proto.Login" Src="Class1.cs" %>

if (username.Text.Equals("") || password.Text.Equals("") || level.Text.Equals("") || name.Text.Equals("") || employeeNo.Text.Equals("") || surname.Text.Equals("") || gender.Text.Equals(""))
           {
               string alert = "Please fill all fields as they are all required";
               ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('" + alert + "')</script>");
           }
           else
           {
               Class1 validate = new Class1();

What I have tried:

I tried creating new class and removing Src=class but error still persist.

Posted 20-Mar-22 23:45pm

tsalong tsalong

Updated 21-Mar-22 0:33am

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Richard MacCutchan 21-Mar-22 6:36am

You have two definitions of Class1 in your application. Please add the complete text of the error message. It is also a very bad idea to use the default names of classes in an application. Change it from Class1 to a meaningful name.

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Richard Deeming · Answer 1 · 2022-03-21T00:33:00

Solution 1

You have two or more source files which contain a class called Class1 in the namespace proto.

The full error message - which you haven't posted - will tell you which files are involved.

Unless you're using partial classes, you can't have the same class in more than one file.

And do yourself a favour and give your classes meaningful names instead of accepting the default name suggested by Visual Studio. Class1 tells you precisely nothing about what the class is for!

Posted 21-Mar-22 0:33am

Richard Deeming

Comments

tsalong tsalong 21-Mar-22 7:37am

i still have the same error even after creating and naming class to MyClass instate of default one

Richard Deeming 21-Mar-22 7:38am

So go and look at the files mentioned in the error message!

tsalong tsalong 21-Mar-22 7:38am

i still have the same error even after creating and naming class to MyClass instate of default one
how do i remove another class

tsalong tsalong 21-Mar-22 7:43am

Compiler Error Message: CS0433: The type 'proto.MyClass' exists in both 'c:\Users\MPS\AppData\Local\Temp\Temporary ASP.NET Files\vs\a74cd612\1e4f2f\App_Web_muc3bocu.dll' and 'c:\Users\MPS\AppData\Local\Temp\Temporary ASP.NET Files\vs\a74cd612\1e4f2f\assembly\dl3\c3589e35\3192a6ab_153dd801\proto.DLL'

Richard Deeming 21-Mar-22 7:46am

OK, that's slightly different. It's usually a temporary issue - if you try refreshing the page a few times, it should eventually sort itself out.

If not, you'll need to clear out the c:\Users\MPS\AppData\Local\Temp\Temporary ASP.NET Files\ folder.

tsalong tsalong 21-Mar-22 7:52am

i cleared the folder but still having the same error message

Richard Deeming 21-Mar-22 7:55am

In that case, you're back to the original problem: you have the same class in the same namespace declared in two places in your code.

tsalong tsalong 21-Mar-22 7:59am

I have switched to chrome, pale moon and firefore browsers but still having the same error.

Richard Deeming 21-Mar-22 8:00am

The problem is NOT the browser. The problem is YOUR CODE.

tsalong tsalong 21-Mar-22 8:08am

AdminUserReg.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AdminUserReg.aspx.cs" Inherits="proto.AdminUserReg" Src="MyClass.cs"%>
when button is clicked it should call this methods from Myclass to perform action

AdminUserReg.aspx.cs
}
else
{
MyClass validate = new MyClass();

tsalong tsalong 21-Mar-22 8:08am

AdminUserReg.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AdminUserReg.aspx.cs" Inherits="proto.AdminUserReg" Src="MyClass.cs"%>

when button is clicked it should call this methods from Myclass to perform action

AdminUserReg.aspx.cs
}
else
{
MyClass validate = new MyClass();

Richard Deeming 21-Mar-22 8:12am

Those code fragments are meaningless, and seem to be unrelated to your question.

You have the same class in the same namespace defined in multiple places in your application. That is the cause of your error. You can't do anything else until you fix that.