This one line code does the exact function.
double d = 42.566454648; double d1 = 23.545548125; double d2 = d + d1; Response.Write(d2.ToString("N3"));
double d = 42.566454648; double d1 = 23.545548125; double d2 = d + d1; Response.Write(d2.ToString("N3"));
I have a sharepoint list contains the columnsIndia Chennai