StreamWriter.WriteLine() function is generating a "Â" character

I am writing some strings in an Excel file. Sometimes the call to the

StreamWriter.WriteLine()  

function unexpectedly creates a "Â" character.

Any idea why?

Update

the code:

StreamWrit开发者_JAVA百科er writer = new StreamWriter(File.Create(outFile)); 
string headerline = ""; 
foreach (DataColumn colum in reportContents.Columns) 
{ 
    headerline = headerline + '"' + row[colum].ToString() + '"' + ',';
} 
writer.WriteLine(headerline);

the output: Personal Protection |Post-Retirement Savings|Pre-Retirement Pension|Tax & Estate Planning

Expected output: Personal Protection |Post-Retirement Savings|Pre-Retirement Pension|Tax & Estate Planning

I get the solution: just i need to specify the default the encoding in StreamWriter like as follows and it works.

StreamWriter writer = new StreamWriter(File.Create(outFile), Encoding.Default);

shuvra

It isn't actually creating an Â character - it's just writing data in a different encoding. If you look at the StreamWriter constructor overloads (http://msdn.microsoft.com/en-us/library/system.io.streamwriter.aspx) you can indicate which encoding you want the StreamWriter to write it's data in.

In case you haven't dealt with encoding before: Joel wrote a good article about it at http://www.joelonsoftware.com/articles/Unicode.html

The character set of your code should be "utf-8".