Question

I realize this is a newbie question, but I’m looking for a simple solution.

I loaded a csv file into DataTable. Let my CSV contains four columns (ColorCode, SirtID, StartDate, EndDate) like this:

#ffffff,s0012,2011/05/01,2011/05/11
#ffffff,s0013,2011/05/03,2011/05/10
#ffffff,s0022,2011/06/01,2011/06/11
#ffffff,s0032,2011/05/01,2011/05/12

I want to return an error message if CSV file contained two or more different ColorCodes like this:

#ffffff,s0012,2011/05/01,2011/05/11 
#ffffff,s0013,2011/05/03,2011/05/10
#ffffff,s0022,2011/06/01,2011/06/11
#000000,s0032,2011/05/01,2011/05/12

What’s the best way to check whether CSV file contained only one ColorCode?

Answer 1

You could do

 DataTable dt = new DataTable();
    .....
    ....
   if(dt.Rows.Count > 0)
     if(dt.Select("ColorCode <> " + dt.Rows[0]["ColorCode"].ToString()).Length > 0)
       throw new Exception("Two or more different ColorCodes exists");