error will come in my programme

Question

private void BtnInsert_Click(object sender, EventArgs e)

{

try

{

SqlConnection con = new SqlConnection("server=.;database=romesh;integrated security=true");

SqlCommand cmd = new SqlCommand("insert into ObjectMethodChecking values('" + TxtFname.Text + "','" + TxtSurname.Text + "','" + Txtaddress.Text + "'," + TxtPhno.Text + ")", con);

cmd.CommandType = CommandType.Text;

con.Open();

cmd.ExecuteNonQuery();

con.Close();

}

catch(Exception ex)

{

MessageBox.Show(ex.Message);

}

}

 

error will come below my attachment