private void insertbtn_Click(object sender, System.EventArgs e)
        {
            SqlConnection myConnection = new SqlConnection("user id=sa;password=qazwsx;initial catalog=test;data source=FZKX-116;");
            myConnection.Open();
            String insertCmd = "insert into test1( IDTB,FirstNameTB,LastNameTB)values(@Id,@FName,@LName) ";
            SqlCommand myCommand = new SqlCommand(insertCmd, myConnection);

            myCommand.Parameters.Add(new SqlParameter("@Id", SqlDbType.Char, 10));
            myCommand.Parameters["@Id"].Value = TB1.Text;
            
            myCommand.Parameters.Add(new SqlParameter("@FName", SqlDbType.Char, 10));
            myCommand.Parameters["@FName"].Value = TB2.Text;
            
            myCommand.Parameters.Add(new SqlParameter("@LName", SqlDbType.Char, 10));
            myCommand.Parameters["@LName"].Value = TB3.Text;
        
        
            myCommand.Connection.Open();
            myCommand.ExecuteNonQuery();
            myCommand.Connection.Close();
            Info.Text = "更新成功！";
        }