set value richtextbox scrollbar

Question

I want to set richtextbox scrollbar in middle of box.
How can this be done?

Answer 1

You can use SetScrollPos to set the scrollbar position, and then use PostMessage to adjust the text to the corresponding position.

        public Form1()  
        {  
            InitializeComponent();  
        }  
        private const int SB_VERT = 0x1;  
  
        [DllImport("user32.dll")]  
        public static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);  
  
        [DllImport("User32.Dll", EntryPoint = "PostMessageA")]  
        static extern bool PostMessage(IntPtr hWnd, uint msg, int wParam, int lParam);  
        private void button1_Click(object sender, EventArgs e)  
        {  
            SetScrollPos(richTextBox1.Handle, SB_VERT, 100, true);  
            PostMessage((IntPtr)richTextBox1.Handle, 0x115, 4 + 0x10000 * 100, 0);  
        }  

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