Compare cells in 2 datagridviews

Question

Hi guys, 

 

I have 2 datagridviews(dgv1 & dgv2) populated with rows with the same columns. 

 

I want to have the row from dgv2 cycle through dgv1 and if a cell is more than that of the row in dgv2 I want to color the background of the cell to mark that it exceeded.  

 

I did get it to work by using foreach and while, but it takes sooooo long to process. Any way I can compare cells that might be quicker. Because atm isong once cell at a time scrolling through all 100 dgv1 rows and then moving to the next cell is taking a long time and I'm sure im beign inneficient. 

while (currentCell < (colCount + 1))
{

    foreach (DataGridViewRow rTestData in dgvSampleTestData.Rows)
    {
       //Test and chenge backgroun color
    }
    currentCell++;
}