C# 将datatable中的某列转换为数组

DataTable dt_Printquantity = new DataTable();
dt_Printquantity = ds.Tables[0]；
  //将SampleNum列转数组
              
 //1：查询指定字段  string[] arraySampleNum = { "1"};
 int[] arraySampleNum = dt_Printquantity.AsEnumerable().Select(d => d.Field<int>("SampleNum")).ToArray();
 //2：转成string类型 并用逗号隔开每个值  
 string myStringOutput = String.Join(",", arraySampleNum.Select(p => p.ToString()).ToArray());
 ViewBag.SampleNum = myStringOutput;