Question

I need to delete columns from datatable where all rows have 0 for value. Or in other words, where sum is 0.

1 2  5   99.9 442.25 221 0
1 2 77.7 889  898     55 0
9 0 66   42    55      0 0

In this example, last column should be removed.

How to do this?

Answer 1

DataTable dt;
int dataWidth = 5;  //use a loop or something to determine how many columns will have data
bool[] emptyCols = new bool[datawidth];  //initialize all values to true
foreach(Row r in dt)
{
    for(int i = 0; i < dataWidth; i++)
    {
        if(r[i].Contents != 0))
           emptyCols[i] = false;
    }
}

for(int i = 0; i < emptyCols.Length; i++)
{
     if(emptyCols[i])
        dt.Columns.RemoveAt(i);
}

I haven’t tested that, but I have done similar stuff with excel columns. The basic logic is there, I don’t know if all of my increments or row numbering is exactly correct. I believe most of the functions I used are available as well.