Richtext box "Block selection"

[kpr2009]

How to achieve block selection effect in winforms, Richtextbox.
Block selection:
1. Open a MS word document and type few lines.
2. Keep the cursor at middle of the first line
3. Press ALT + drag mouse
seleciton of text is block level (vertical selection).
Any code snnippet or pointer ?
Googeled/MSDNed ...but no luck

[VLSJ]

How to achieve block selection effect in winforms, Richtextbox.
Block selection:
1. Open a MS word document and type few lines.
2. Keep the cursor at middle of the first line
3. Press ALT + drag mouse
seleciton of text is block level (vertical selection).
Any code snnippet or pointer ?
Googeled/MSDNed ...but no luck

Hi kpr2009,
I'm also looking for the same block selection feature in RichTextbox. Pleae share with me if you find the solution. Thanks in advance..