how to remove end comma from the string

 

      for (int i = 0; i < dt.Rows.Count; i++)

        {

            if (i == dt.Rows.Count - 1)

                st += dt.Rows["item"].ToString();

            else

                st += dt.Rows["item"].ToString() + ",";

        } 

DataTable dt = new DataTable();

dt.Columns.Add("Item");

dt.Rows.Add("abc@gmail.com");

dt.Rows.Add("xya@yahoo.com");

dt.Rows.Add("dfd@gmail.com");



//Solution 1: String.Join()

 var result1 = string.Join(",",dt.AsEnumerable().Select(row => row["Item"].ToString()).ToArray());



//Solution 2: Aggregate Extension Method

 var result2 = dt.AsEnumerable().Select(row => row["Item"].ToString()).Aggregate((a, b) => a + "," + b);