To get list of drives and create a directory in selected drive

First create a combobox button which shows list of drives. Also create a radiobutton , a label , a textbox and a button .
Initial during the page load label, textbox and button visibility is false.And when the radiobutton is clicked their visibity is true.

GetLogicalDrives is a method od directory class used to get list of drives.
following is the code which is to be written in form1.cs page:

//To get all logical drives GetLogicalDrives method of Directory class is //used
 private void Form1_Load(object sender, EventArgs e)
        {
            String[] drive;
            drive = Directory.GetLogicalDrives();
            for (int i = 0; i < drive.Length; i++)
            {
                cmbdrive.Items.Add(drive[i].ToString());
            }
        }
//It will create a directory and if it already exist a message is displayed //that directly already exists.
        private void btnCrDir_Click(object sender, EventArgs e)
        {
            string s = txtDirname.Text;
            
                if (Directory.Exists(s))
                {
                  MessageBox.Show("Directory Already Exists");
                }
                 else
                {
                Directory.CreateDirectory(s);
                MessageBox.Show("Directory Created");
                }
            
        }

        private void rbdcdir_CheckedChanged(object sender, EventArgs e)
        {
            label1.Visible = true;
            txtDirname.Visible = true;
            btnCrDir.Visible = true;
        }