cmd.executenonquery() error in c#
private void SaveBtn_Click(object sender, EventArgs e)
{
SqlConnection Con = new SqlConnection("Data Source=DESKTOP-BSJERV7\\YAKUBMUCK;Initial Catalog=LoginDatabase;Integrated Security=True");
SqlCommand cmd = new SqlCommand(@"INSERT INTO [dbo].[Student]
([FirstName]
,[LastName]
,[MiddleName]
,[Gender]
,[DOB]
,[Address]
,[Form]
,[Contact]
,[Parent]
,[Fee])
VALUES
('" + FirstNameTextBox.Text + "','" + LastNameTextBox.Text + "','" + MiddleNameTextBox.Text + "','" + GendercomboBox.SelectedItem.ToString() + "','" + DOBdateTimePicker.Value.Date + "','" + LComboBox.SelectedItem.ToString()+ "','" + ContactextBox.Text + "', '" + ParentTextBox.Text+ "','" + FeeTextBox.Text + "')");
Con.Open();
cmd.ExecuteNonQuery();
Con.Close();
MessageBox.Show("Save successifully");
}