.net Folder Browser Dialog usage

try{
FolderBrowserDialog f = new FolderBrowserDialog();

OpenFileDialog f1 = new OpenFileDialog();f1.Filter =
"MSI files (*.msi)|*.msi|All files (*.*)|*.*";
if (f1.ShowDialog() == DialogResult.OK) // selecting directory{
txtqueryval.Text = f1.FileName;
}
}
catch (Exception ex){

MessageBox.Show(ex.Message, "Image Resizer Information", MessageBoxButtons.OK, MessageBoxIcon.Information);}