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To display the message box in asp.net

Use the namespace

using System.Runtime.InteropServices;

Then use DllImport

"DllImportAttribute Class Indicates that the attributed method is exposed by an unmanaged dynamic-link library (DLL) as a static entry point."

Use the lines below

[DllImport("user32.dll", CharSet = CharSet.Unicode)]

public static extern int MessageBox(IntPtr hWnd,String Text,String Caption,uint type);

InPtr This type implements the ISerializable interface.

And then put this code

MessageBox(new IntPtr(0), "Hello World", "Hello Dialog name", 0);

Note:

The DllImportAttribute does not support marshaling of generic types.

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