Code:
if (dbConnect.InsertRegister(this.txtUsername.Text, this.txtPassword.Text, this.cboGender.Text, this.txtEmail.Text) == true)
                {
                    Reset();
                }
Code:
public void Reset()
        {
            if (btnClose.Text == "&Close")
            {
                Close();
            }
            else
            {
                btnClose.Text = "&Close";
                txtUsername.Clear();
                txtPassword.Clear();
                txtRepassword.Clear();
                txtEmail.Clear();
                cboGender.SelectedIndex = 0;
                errorProvider1.Clear();
                errorProvider2.Clear();
                errorProvider3.Clear();
                errorProvider4.Clear();
            }
        }
on form