第一种方法:

            string str="server=.;uid=sa;pwd=111111;database=text_db";//连接字符串

        SqlConnection SCON = null;//连接对象

        SqlCommand SCom=new SqlCommand();//命令对象

            SCON=new SqlConnection(str);

            SCON.Open();

          SCom.CommandText = "insert into cum(nm,age,sex,addr) values(‘”+name1+”’, ‘”+age1+”’, ‘”+sex1”’,’”+addr1+”’); insert into cum(nm,age,sex,addr) values(‘”+name1+”’, ‘”+age1+”’, ‘”+sex1”’,’”+addr1+”’)";

            SCom.Connection = SCON;

            SCom.CommandType = CommandType.Text;

            int num = SCom.ExecuteNonQuery();

            SCON.Close();

           注意：这种执行我不推荐这也就是把多条sql语句写成了一条sql语句就行执行（大家如果要一次连接想执行多条sql语句那用下面的）

第二种方法:

       string str="server=.;uid=sa;pwd=111111;database=text_db";//连接字符串

        SqlConnection SCON;

        SqlCommand SCom1=new SqlCommand();//要执行sql语句的第一个命令对象

        SqlCommand SCom2=new SqlCommand();//要执行sql语句的第二个命令对象

            SCON=new SqlConnection(str);

            SCON.Open();

           //第一条要执行的sql语句

           SCom1.CommandText = "insert into cum(nm,age,sex,addr) values(@name,@age,@sex,@addr)";

            SCom1.Parameters.Add("@name", SqlDbType.Text);

            SCom1.Parameters.Add("@age", SqlDbType.Int);

            SCom1.Parameters.Add("@sex", SqlDbType.Bit);

            SCom1.Parameters.Add("@addr", SqlDbType.Text);

            SCom1.Parameters["@name"].Value = name1;

            SCom1.Parameters["@age"].Value = age1;

            SCom1.Parameters["@sex"].Value = sex1;

            SCom1.Parameters["@addr"].Value = addr1;

            SCom1.Connection = SCON;

            SCom1.CommandType = CommandType.Text;

            int num = SCom1.ExecuteNonQuery();

          //第二条要招行的sql语句

            SCom2.CommandText = "insert into cum(nm,age,sex,addr) values(@name,@age,@sex,@addr)";

            SCom2.Parameters.Add("@name", SqlDbType.Text);

            SCom2.Parameters.Add("@age", SqlDbType.Int);

            SCom2.Parameters.Add("@sex", SqlDbType.Bit);

            SCom2.Parameters.Add("@addr", SqlDbType.Text);

            SCom2.Parameters["@name"].Value = name2;

            SCom2.Parameters["@age"].Value = age2;

            SCom2.Parameters["@sex"].Value = sex2;

            SCom2.Parameters["@addr"].Value = addr2;

            SCom2.Connection = SCON;

            SCom2.CommandType = CommandType.Text;

            int num = SCom2.ExecuteNonQuery();

SCON.Close();

   这种方法就是利用了一个SqlConnection对象进行一次连接，在关闭前执行多个SqlCommand命令对象，执行在进行关闭连接