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Category: Beginning
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If varible is string, then to check if it is null use:

if (containerid.IsNullOrEmpty())
{  containerid = "-1"; }

Or String.IsNullOrEmpty()

Because null is not empty...

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Category: Beginning
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Start new Windows Forms Application, for example, name it MyInheritance.

In solution explorer right clink on MyInheritance, like on picture:

Then, in project properties under Output type choose Console Application like on picture:

Save it. Put a button on a form (add form if it doesn't exist), build project.

 

Then, to test it, go to the File -> Add -> New project... Then choose Windows Forms Application, in the solution explorer right click on References, go to the project tab and choose MyInheritance, then right click on this new project -> Add -> New item ->Windows Forms -> Inherited Form -> Ok and this is it.

 

If you want to change a component in your inhertited form, then choose property Modifiers from MyInheritance and change it to Public.

 

Taken from here.

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Category: Beginning
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In VS.NET go to the project property page and in configuration properties>build set Allow Unsafe Code Blocks to True.


Taken from here.