Ref this example for scott : http://www.hanselman.com/blog/ASPNETResponseWriteAndResponseOutputWriteKnowTheDifference.aspx

Response.Write() and Response.Output.Write() both are used for print output on the screen. But their are is a difference between both of them1. Response.Output.Write() is allows us to print formatted output but Response.Write() can't allows the formatted output. Example:Response.Output.Write(".Net{0},"ASP"); // Its writeResponse.Write(".Net{0},"ASP"); // Its Wrong2. As Per Asp.Net 3.5, Response.Write() Has 4 overloads, with Response.Output.Write() has 17 overloads.

Hi chand, pl refer this one. http://stackoverflow.com/questions/1794792/what-s-the-difference-between-response-write-andresponse-output-write

Response.Output.Write() gives you String.Format-style formatted output and the Response.Write() doesn't.

FOR Example
Response.Write("Current Date Time is "+DateTime.Now.ToString());

Response.Output.Write("{0} is {1:d}", "Current Date Time is: ",DateTime.Now);

Thanks
Gurjinder Singh Brar
http://agileguru.blogspot.com/

The respose.write just outputs a string to webpage. Response.Output.Write formats the string as per specified options before writing to the the webpage