在C#中出现未处理sqlException怎么处理

string sql = string.Format("insert into student(sNo,sName,sex,birthday,entryDate,sDept)values('{0}','{1}','{2}','{3}','{4}','{5}')", a, b, c, d, f, g);
SqlConnection con = new SqlConnection("Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=StuInfo;Data Source=desktop-gcu7165");
con.Open();
cmd = new SqlCommand(sql, con);
int i = (int)cmd.ExecuteNonQuery();
if (DialogResult.OK == MessageBox.Show("确定插入记录？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Stop))
{
if (i > 0)
{
textBox1.Text = dataGridView1.Rows[i].Cells["sNo"].Value.ToString();
textBox2.Text = dataGridView1.Rows[i].Cells["birthday"].Value.ToString();
textBox3.Text = dataGridView1.Rows[i].Cells["entryDay"].Value.ToString();
textBox4.Text = dataGridView1.Rows[i].Cells["sName"].Value.ToString();
textBox5.Text = dataGridView1.Rows[i].Cells["sex"].Value.ToString();
textBox6.Text = dataGridView1.Rows[i].Cells["sDept"].Value.ToString();

            }
        }
    }

看下报错的错误提示，哪一行代码出现的异常。