How to clone row[I-1].coloumns[0] from datatable C#

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Hello, i have an excel file and need to get certaain data from this file and show it in a datagridview but i have a problem. I need to clone the cell value of the previous row of my datagridview if row[i].itemarray[0] is null.

What I have tried:

for (int i = 1; i < dt.Rows.Count; i++)
{
 if (d.Rows[i].ItemArray[0].ToString() == "" || d.Rows[i].ItemArray[0].ToString() == null)
    {
          d.Rows[i].ItemArray[0] = d.Rows[i - 1].ItemArray[0];
     }
}

Posted 23-Dec-20 23:12pm

houssem eddine ayari

Updated 24-Dec-20 4:35am

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Richard MacCutchan 24-Dec-20 6:24am

And? What is the question?

1 solution

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Gerry Schmitz · Accepted Answer · 2020-12-24T04:35:00

If you store the value of each iteration at the end of the loop, then you can access it at the beginning of the next loop (if you need it), without having to "index backwards".

Obviously, the first time around, there is no "previous value", so you would initialize the "previous" variable to null (or something) and test for that (indicating it's the "first loop").

Your current solution doesn't handle the "first loop" properly: you're indexing into "nowhere".

And you're first row is at index "0", not "1".