creating CSV with C# from seperate strings

I want to build a CSV file from separate strings but since the size of the string is big I'm trying to avoid from joining the strings into a single string before writing to the file. Meaning, creating a file and than adding anothe开发者_如何学Cr string into it. can it be done?

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Rather than using String go for StringBuilder to build your string.

than flush string in file.

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You could use the StreamWriter object http://msdn.microsoft.com/en-us/library/system.io.streamwriter.aspx

Have a look here as well

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If you are using StreamWriter Class then simply call Write method each time you want to write value to file.

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Here is a full demo for creating a text file, including a function for appending strings to it after creation.

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Refer to this coding.

 StringBuilder Content1 = new StringBuilder();
 Content1.Append("MailFrom:" + FromAdd + Constants.vbCrLf);
 Content1.Append("MailTo:" + EmailID + Constants.vbCrLf);
 Content1.Append("MailCC:" + MailCC + Constants.vbCrLf);
 Content1.Append("MailBCC:" + MailBCC + Constants.vbCrLf);
 Content1.Append("MailSubject:" + MailSubject + RequestNumber + Constants.vbCrLf);
 Content1.Append("MailAttachment:" + MailAttachment + Constants.vbCrLf);
 Content1.Append("MailBody:" + "" + Constants.vbCrLf);
 if (!File.Exists(Application.StartupPath)) {
SW = File.CreateText(Application.StartupPath + "\\" + FinalPath);
using (fs) {
}
Thread.Sleep(1000);
  }
  using (SW) {
SW.Write(Content1.ToString);
 }

Use the above method for creating a text file and writing the content.