Question

I have a loop in my app. Code is following :-

foreach (DataRow dr in dt.Rows)
    ColorNames +=dr["ColorName"].ToString() + "\n";

But i don’t want to add \n at the last Datarow. Any suggestion how to do it?

Answer 1

Foreach do not work on index.

Option 1: ForEach Loop

Use foreach loop. Loop till last and outside loop do like

ColorNames.Substring(0, ColorNames.Length-1);

Option 2: For Loop

Use for loop and check for index inside loop for all indexes till last. add \n and in last index do not add \n

for (int i = 0; i < dt.Rows.Count; i++)
{
   ColorNames += i < dt.Rows.Count-1 
           ? dr["ColorName"].ToString() + "\n"
           : dr["ColorName"].ToString();
}

OR

for (int i = 0; i < dt.Rows.Count; i++)
   ColorNames += dr["ColorName"].ToString() + (i < dt.Rows.Count-1 ?  "\n": "");

Option 3: LINQ

ColorNames = String.Join("\n", dt.Rows.Select(dr => dr["ColorName"].ToString()));