SaveFileDialog setting default path and file type?

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The SaveFileDialog control won’t do any saving at all. All it does is providing you a convenient interface to actually display Windows’ default file save dialog.

  1. Set the property InitialDirectory to the drive you’d like it to show some other default. Just think of other computers that might have a different layout. By default windows will save the directory used the last time and present it again.

  2. That is handled outside the control. You’ll have to check the dialog’s results and then do the saving yourself (e.g. write a text or binary file).

Just as a quick example (there are alternative ways to do it).
savefile is a control of type SaveFileDialog

SaveFileDialog savefile = new SaveFileDialog(); 
// set a default file name
savefile.FileName = "unknown.txt";
// set filters - this can be done in properties as well
savefile.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";

if (savefile.ShowDialog() == DialogResult.OK)
{
    using (StreamWriter sw = new StreamWriter(savefile.FileName))
        sw.WriteLine ("Hello World!");
}

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