C# 將datatable中的某列轉換爲數組

DataTable dt_Printquantity = new DataTable();
dt_Printquantity = ds.Tables[0]；
  //將SampleNum列轉數組
              
 //1：查詢指定字段  string[] arraySampleNum = { "1"};
 int[] arraySampleNum = dt_Printquantity.AsEnumerable().Select(d => d.Field<int>("SampleNum")).ToArray();
 //2：轉成string類型 並用逗號隔開每個值  
 string myStringOutput = String.Join(",", arraySampleNum.Select(p => p.ToString()).ToArray());
 ViewBag.SampleNum = myStringOutput;