Try like this code, I guess this code is helpfull for u.
Code:
int Value1=0, Value2=0;
for (int row = 0; row < dataGridView1.Rows.Count; ++row)
{
Value1 = int.Parse(dataGridView1.Rows[row].Cells["Column1"].Value.ToString());
Value2 = int.Parse(dataGridView1.Rows[row].Cells["Column2"].Value.ToString());
if(Value1 > Value2)
MessageBox.Show("Largest value
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