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Hi, i'm a newbie, so in this problem i made a WPF Project with Visual Basic Code in Visual Studio 2019. And, i made 2 form. Like in the image.

1st Form's name was "LoginForm", the 2nd form's name was "MainForm"

Then, when in 1st Form, i wanted that when i pressed a button, it opens or shows up the 2nd form.

But, I can't find the 2nd form while typing "MainForm" in 1st Form. And the error says :

"Error BC30451 'MainForm' is not declared. It may be inaccessible due to its protection level."

Either the 2nd form was not considered as an object by the project or something. Do you guys have any ideas how to make it possible?

What I have tried:

1. Since the "MainForm" Was Classed as "Window1", i tried to type the code to define the "Window2" with :

Dim MainForm As New Window1


But it made another error :
"Error BC30454 Expression is not a method."

2. I tried to define "MainForm" as an object with :

Dim MainForm As Object


But i'm afraid the result will be an error because i'm trying to open up perhaps a null object.




Thank you so much for your future help.
Posted
Updated 24-Jan-21 21:16pm
Comments
Richard MacCutchan 23-Jan-21 4:49am    
Without seeing your code it is impossible to guess what is the problem.

1 solution

If the window's class name is MainForm, then you need to declare and create a variable of that type.
VB.NET
Dim window1 As New MainForm
 
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