How to can I control the Scrollbar on the Textbox...??

How to can I control the Scrollbar on the Textbox...??

• Michael J Brown

  This is possible similar to the way I did it for the ListBox. However, it has very little practical value for a TextBox. Its scrolling behavior is controlled by the caret position, available as the SelectionStart property. You'd use the ScrollToCaret() method to force the TextBox to scroll to make the caret visible.
  
  
  

• Amir__

  I have a multiline textbox in C# and am trying to use the Insert() and Delete() methods. Whenever I do, the textbox reloads and scrolls to the first line in the textbox. If I use the SelectionStart property and then the ScrollToCaret() method after using Insert() or Delete() the first line of the textbox is different than before I made the call causing the display to seem to move to the user. How can I keep the same line at the top of the textbox after using Insert() or Delete()

  
  

• connect2sandeep

  You'll have to P/Invoke the GetScrollInfo() API function to find out where the thumb is at. Try this:
  
  using System.Runtime.InteropServices;
  ...
  public static double GetScrollPercentage(TextBoxBase ctl) {
  SCROLLINFO info = new SCROLLINFO();
  info.cbSize = Marshal.SizeOf(info);
  info.fMask = 0x17;
  GetScrollInfo(ctl.Handle, 1, ref info);
  if (info.nMax <= info.nPage + 1) return 100;
  return 100.0 * info.nPos / (info.nMax - info.nPage + 1);
  }
  
  [DllImport("user32.dll")]
  private static extern bool GetScrollInfo(IntPtr hwnd, int fnBar, ref SCROLLINFO lpsi);
  [StructLayout(LayoutKind.Sequential)]
  struct SCROLLINFO {
  public int cbSize;
  public uint fMask;
  public int nMin;
  public int nMax;
  public uint nPage;
  public int nPos;
  public int nTrackPos;
  }
  
  
  
  

• arvindbksc

  Thanks a lot, nobugz!
  
  

• Gurpreet Singh Gill

  
  Thanks, nobugz.
  
  I've done auto scroll for the Textbox. but, I've one more question.
  I want to know whether thumb position is bottom or not when input to the Textbox.
  This problem wasn't solved using WinProc and WM_VSCROLL.
  
  
  
• How to can I control the Scrollbar on the Textbox...??