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ScrollableControl.SetAutoScrollMargin Method

Sets the size of the auto-scroll margins.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public void SetAutoScrollMargin(
	int x,
	int y


Type: System.Int32
The Width value.
Type: System.Int32
The Height value.

The margin sets the width and height of the border around each control. This margin is used to determine when scroll bars are needed on the container and where to scroll to when a control is selected.


If a negative number is passed in as the x or y values, the value will be reset to 0.

The following code example uses the derived class, Panel. The example evaluates the location of a text box and changes the appearance and behavior of its parent container, the panel control. The example requires that you have created an instance of a Panel control, TextBox, and Button. Place the box on the panel so that it overlaps at least one of the panel's edges. Call this subprocedure on the click of a button to see the difference in the panel's behavior and appearance.

private void MySub()
    /* If the text box is outside the panel's bounds, 
       turn on auto-scrolling and set the margin. */
    if (text1.Location.X > panel1.Location.X ||
     text1.Location.Y > panel1.Location.Y)
       panel1.AutoScroll = true;
       /* If the AutoScrollMargin is set to 
          less than (5,5), set it to 5,5. */
       if(panel1.AutoScrollMargin.Width < 5 ||
        panel1.AutoScrollMargin.Height < 5)
          panel1.SetAutoScrollMargin(5, 5);

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.