Question

I want to move file , and rename it , the problem is that I don’t know its extension and its original name , I select using openfile dialoge

any suggestion to solve that

Answer 1

this.openFileDialog1.ShowDialog();
int start = this.openFileDialog1.FileName.LastIndexOf('.') + 1;
string newLoc = @"C:\NewFileName." + 
    this.openFileDialog1.FileName.Substring(start,3); //<-- gets the file extension
File.Move(this.openFileDialog1.FileName, newLoc);