获取当前插入记录的ID

    其中sql语句写法为：INSERT   INTO   table(a,b)   VALUES   (1,2)   SELECT   @@IDENTITY   AS   'Identity' ,然后用SqlCommand 对象的ExecuteScalar()方法获取即可，下面是写好了的一个函数。

public static int ExecuteSql(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteScalar();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        throw new Exception(E.Message);
                    }
                }
            }
        }