How to separate array value by comma.

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i am unable to separate array item by comma.

What I have tried:

List<string> list = new List<string>();


          foreach (DataRow row in dt.Rows)
          {

              list.Add((string)Convert.ToString(row["partDesc"]));
                }

          Array test = list.ToArray();

Posted 1-Apr-18 19:44pm

ADI@345

Updated 1-Apr-18 20:00pm

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OriginalGriff · Accepted Answer · 2018-04-01T20:01:00

Only strings can contain items separated by commas, and every item in the sting must also be a string - lists contain the items in their "native" format.
However it's not difficult at all to create a string from a List using string.Join:

List<int> myList = new List<int>() { 1, 2, 3, 4, 666, 17, 42 };
string commaSeparated = string.Join(",", myList);

This will use the default ToString implementation so it will work with any class that overrides ToString.

Alternatively, in your specific case, just use a StringBuilder:

StringBuilder sb = new StringBuilder();
string sep = "";

foreach (DataRow row in dt.Rows)
    {
    sb.AppendFormat("{0}{1}", sep, (string)Convert.ToString(row["partDesc"]));
    sep = ",";
    }
string commaSeparated = sb.ToString();