I have a textbox that should send any text to a server program. I have a keypress event that activates upon pressing an enter key. It sends the messages plus additional character(carriage return). How can I remove this character. I already tried using trim and replace but did not work..I also want my cursor to go back to position 0,0 of textbox. I tried Focus() and SelectionStart but I don't like the outcome. Is there a way to set the position of the cursor to row 1 col 1 after pressing enter key?

What purpose is being served by sending the cursor (caret) back to 0,0? That seems very unexpected from a usage standpoint. I could understand if you were to simple clear out the contents, then the caret would go there implicitly.

-Peter
compiledthoughts.com

I want my textbox to clear out all its content and move back to its initial position, like in any typical chat applications. Whenever i run my program the cursor goes to the next row and rests there. I want to move it back but can't find solution..By the way thanks..

So do what Peter said: Just clear all the contents of the text box and presto. You will be giving the user a blank field, again. Yes, with the cursor at the start.

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As for the ending NEWLINE character: Two ways.
(1) Using JavaScript, instead of trapping the key via ONKEYPRESS, try trapping it via ONKEYDOWN and then *cancelling* the ENTER key! That way, it won't even end up in the field.

(2) Using C#, just wipe out the last one or two characters of the string. (You'll need to check to see if the ENTER key put just "\n" on the end of the text [Unix style] or "\r\n" [Windows style].)
Lots of ways to do that using the various string class functions. Just look up the .NET docs for the String class.
http://msdn.microsoft.com/en-us/library/system.string_members(VS.80).aspx
Huh. I didn't even know this method existed! Look how easy they have made it for you:
http://msdn.microsoft.com/en-us/library/system.string.trimend(VS.80).aspx

I managed to remove the carriage returns using Trim(), All the text are cleared but the cursor remains in the 2nd row.

I know this post is old but I had the same problem and found no solution that worked on the internet, but I was trying several things and this fixed the problem:
txtbox.Multiline = false;
txtbox.Multiline = true;

(on the keypress event)
Just like that. No sense, but worked.