ارسال داده از طریق combobox

[yanni2]

 SqlCommand cmd1 = new SqlCommand("insert into ostad(name,lname,shsh,tel,reshte,doreshte,belt,day  swork,dayework,address,des) values('" + textBoxX2.Text + "','" + textBoxX3.Text + "','" + textBoxX5.Text + "','" + maskedTextBox1.Text + "','" + textBoxX7.Text + "','" + comboBox1.SelectedValue + "','" + textBoxX6.Text + "','" + maskedTextBox2.Text + "','" + maskedTextBox3.Text + "','" + textBoxX10.Text + "','" + textBoxX4.Text + "')", conn);