C# Signature:

[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern uint MessageBox(IntPtr hWnd, String text, String caption, uint type);

VB Signature:

Imports System.Runtime.InteropServices
<DllImport("user32.dll", CharSet:=CharSet.Auto)> _
Shared Function MessageBox(ByVal hwnd As IntPtr, ByVal t As String, ByVal caption As String, ByVal t2 As UInt32) As Integer
End Function

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

Input something

Sample Code C#:

    using System;
    using System.Runtime.InteropServices;    

    class Class1
    {
        [DllImport("user32.dll", CharSet=CharSet.Auto)]
        public static extern int MessageBox(IntPtr hWnd, String text, String caption,
            uint type);

        [STAThread]
        static void Main(string[] args)
        {
            Class1.MessageBox(new IntPtr(0), "Text", "Hello", 0 );
        }
    }

Sample Code VB:

        MessageBox(New IntPtr(0), "Text", "Hello", Convert.ToUInt32(MessageBoxButtons.OK))

}

Alternative Managed API:

System.Windows.Forms.MessageBox.Show

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).