Save file with appropriate extension in a Save File prompt

c# winforms file-extension savefiledialog
novacara picture novacara · Jul 31, 2009 · Viewed 33.8k times · Source

In my application I use a SaveFileDialog to pop up a Save As window. I have restricted in the file type section the file to be saved as .dat with the following code.

sfdialog.Filter = "Data Files (*.dat*)|*.dat*";

What I want to know how to do is make it automatically save with the .dat extension. Currently it just saves with no extension unless I specifically save it as filename.dat.

Answer

Francis B. picture Francis B. · Jul 31, 2009 
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "Data Files (*.dat)|*.dat";
dlg.DefaultExt = "dat";
dlg.AddExtension = true;

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