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How to keep the scrollbar down in Windows Form MultiLine TextBox

In a MultiLine textbox when a large amount of text is put into, a scrollbar appears if the scrollbar property has been set to vertical. But by default the scrollbar maintains its position at top no matter how long the text content is. If you want to programmatically keep the scrollbar down to the last entered text , then use the SelectionStart and ScrollToCaret(). They are found in the namespace System.Windows.Forms

SelectionStart Property

  • It gets/sets a character index for the begining of the current selection.
  • In case the specified selection ends between a carriage return and a new-line character, the selection length is automatically increased by 1 to span the end-of-line marker.
  • If there is no selection, the SelectionStart value gets or sets the location of the cursor.
ScrollToCaret() Method
  • It scrolls the content of the control to the current caret position i:e until the caret is with in the visible region of the control.
Example
 
        txtTextBoxID.SelectionStart = txtTextBoxID.Text.Length;
     txtTextBoxID.ScrollToCaret();
 
The first line will set the SelectionStart value to the length of the text inside the textbox and then the ScrollToCaret method will scroll the scrollbar such that, that caret will come to visible.
 
* These properties are Windows Form feature and not available for System.Web.UI i:e for Webcontrols.
Tushar Mishra , Dot Net Developer, Mindfire Solutions.
Related Tags: NET, Scrollbar
Author : Tushar Mishra

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