Question

I have a table an some values on it. If the Row Cell “Name” is not empty change color of background to violet.

Name    ID    Customers

Niky    1     yes       // here change background to violet
        2     no
Donna   3     yes       // here change background to violet
Baka    4     no        // here change background to violet
        5     yes
        6     no

I have tried this code but i doesnt work, dont know why:

 foreach (DataGridViewRow row1 in dataGridView1.Rows)
        {
            if (row1.Cells[0].Value != null)
            {
                row1.DefaultCellStyle.BackColor = Color.Violet;
            }
        }

Answer 1

The usual place to put this sort if code in within the DataBindingComplete event handler, either attach the event as below or using the designer:

dataGridView1.DataBindingComplete += new DataGridViewBindingCompleteEventHandler(dataGridView1_DataBindingComplete);

Then in the handler you have something like this:

void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
    foreach (DataGridViewRow row1 in dataGridView1.Rows)
    {
        if (row1.Cells.Cast<DataGridViewCell>().Any(c => c.Value == null || string.IsNullOrWhiteSpace(c.Value.ToString())))
        {
            row1.DefaultCellStyle.BackColor = Color.Violet;
        }
        else
        {
            row1.DefaultCellStyle.BackColor = Color.White;
        }
    }
}

In the code above I’ve changed your original code to now looks at all cells rather than just the first.

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You can also put the code in the CellFormatting event.