Change password validation

Question

I am developing a windows application, my database is in MS-Access, i have made one ChangePassword Form this form will show error message if user tries to change password of some other user. And i want that the user who have the admin rights will able to change the password of any user including itself. Please help me out. Here is my coding, try { ConnectionClass l_ConnectionClass = new ConnectionClass(); UserName = txtusername.Text; oldPassword = txtoldpwd.Text; newPassword = txtnewpwd.Text; ConfirmnewPassword = txtconfirmpwd.Text; DialogResult dlgResult = MessageBox.Show("Do you want to change your password.", "Continue?", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2); if (dlgResult == DialogResult.Yes) { l_ConnectionClass.changepassword(PublicVariables.OSUserID, UserName, oldPassword, newPassword, ConfirmnewPassword); MessageBox.Show("Password Successfully Changed"); ClearFields(); } else if (dlgResult == DialogResult.No) { ClearFields(); } } catch (Exception Ex) { MessageBox.Show("Connection Failed. Plz Check your Network Cable Connection", "Error", MessageBoxButtons.OK); } Please help with the coding