只需继续执行您的代码-您就在正确的轨道上：

  //调用SQL帮助程序类以获取初始数据
 DataTable dt = sql.ExecuteDataTable（ sp_MyProc）; 

 dt.Columns.Add（ NewColumn，typeof（System.Int32））; 

 foreach（dt.Rows中的DataRow行）
 {
 //需要将值设置为NewColumn列
 row [ NewColumn] = 0; //或将其设置为其他值
} 

 //可能在设置所有新值
 $后将您的数据集保存在此处p $ p> 
How do I add a new DataColumn to a DataTable object that already contains data?

PseudoCode
//call SQL helper class to get initial data 
DataTable dt = sql.ExecuteDataTable("sp_MyProc");

dt.Columns.Add("NewColumn", type(System.Int32));

foreach(DataRow row in dr.Rows)
{
    //need to set value to NewColumn column
}

Just keep going with your code - you're on the right track:
//call SQL helper class to get initial data 
DataTable dt = sql.ExecuteDataTable("sp_MyProc");

dt.Columns.Add("NewColumn", typeof(System.Int32));

foreach(DataRow row in dt.Rows)
{
    //need to set value to NewColumn column
    row["NewColumn"] = 0;   // or set it to some other value
}

// possibly save your Dataset here, after setting all the new values