How To Make a "Enter" key by C# in ASP.net -

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i wrote code in c#: 

using (streamwriter streamwriter = file.createtext(@"c:\file.html")) {     streamwriter.writeline(textbox2.text); }

this code opens file.html , copies value of textbox2 when open file.html characters on 1 line, though there multple lines of text in textbox. how newline characters show in file?

try

streamwriter.writeline(textbox2.text.replace(environment.newline, "<br/>"));

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