I want datagridview in windows application(C#.net), type in "this is the first line allows the 50 char", if you press "letter" and type "this is the second line", the current cell and go to the cell right below it. What I want is, when I press "letter" and type in , see the following in the same cell:

Thanking You

What do you mean by "letter"?
Is it any key on the keyboard?
Is it the return key or the enter key?