OpenFileUpload

                    OpenFileDialog ofd1 = new OpenFileDialog();
                    //define as propriedades do controle 
                    //OpenFileDialog
                    ofd1.Multiselect = true;//false;
                    ofd1.Title = "Selecionar Arquivos";                   
                    ofd1.InitialDirectory = @"C:\\pasta1\\pasta2\\";
                    //filtra para exibir todos arquivos
                    ofd1.Filter = "All files (*.*)|*.*";
                    ofd1.CheckFileExists = true;
                    ofd1.CheckPathExists = true;
                    ofd1.RestoreDirectory = true;

                    //ofd1.ReadOnlyChecked = false;

                    foreach (String file in ofd1.FileNames)
                    { 
                        //MessageBox.Show(file); 
                        string s=file;
                    }