C# winfrom µ¼³öword

public void ExportWord(string str){ System.Windows.Forms.SaveFileDialog objSave = new System.Windows.Forms.SaveFileDialog(); objSave.Filter = "(*.doc)|*.doc|" + "(*.*)|*.*";//+ "(*.txt)|*.txt|" objSave.FileName = DateTime.Now.ToString("yyyyMMddHHmm") + ".