Jayesh,

thanks, good suggestion but non of the forms are abstract and there is no code at all (besides VS generated InitializeComponents()) in the constructor. And both forms don't have any controls they are absolutly empty out of the VS Box.

Marcus

>Is Form1 declared as ABSTRACT? .NET IDE instantiates the parent object when child is opened in a designer. ABSTRACT clause won't let it happen. Also, if you have any code into constuctor of the parent, it will fire.
>
>>Hello,
>>
>>I have set up 2 Forms. Inheritance structure:
>>Windows.System.Form
>>...+Form1
>>.......+Form2
>>
>>Wenn now opening Form2 with VS Form Designer I get an error Message that the baseclass Marcus.Test.Form1 can not be loaded. Has anyone got an idea how to get around this without compiling form1 into an own assembly ?
>>
>>Marcus
>>
>>Code snippets of Class definition
>>

>>namespace Marcus.Test
>>{
>>	public class Form1 : System.Windows.Forms.Form
>>	{
>>......
>>
>>namespace Marcus.Test
>>{
>>	public class Form2 : Form1
>>	{
>>
>>
>>
>>