How to Check string is Same as in Database

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C#

SQL-Server

WPF

C#4.0

Hi
I have textbox data which am inserting the data into sqlserver.

eg:txtbox.Text="Dotnet Framework";

For checking whether "Dotnet Framework " existed or not with the below query and it works fine

ALTER PROCEDURE [dbo].[spCheckDuplicateName]
(@CheckValue varchar(100),
@ReturnValue int out)
AS
SET NOCOUNT ON
BEGIN
IF Exists (SELECT TOP 1 Name From tblName WHERE Name = @CheckValue)
set @ReturnValue = 3;
Else
SET @ReturnValue=0; 
END

but if enter again string as"DotnetFrameWork", it considering it as new name and inserting,which i dont want to insert it.

You may feel its a silly question to ask but i couldn't do it.

Any idea to achieve this.So that i can't inserting same name with out space.