changing row backcolor in datagridview

Question

I have Problem with changing rows color in Windows Forms. I did it with Columns and tried the same for Rows but it didn't work. Can someone show me how to do it?

My Code so far:

 public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        abc();
    }

    void abc()
    {
        DataTable hh = new DataTable();
        hh.Columns.Add("1", typeof(string));
        hh.Columns.Add("2", typeof(string));
        hh.Columns.Add("3", typeof(string));

        hh.Rows.Add(new object[] { "a", "b", "c" });
        hh.Rows.Add(new object[] { "a1", "b1", "c1" });
        hh.Rows.Add(new object[] { "a2", "b2", "c2" });

        dataGridView1.DataSource = hh;

        foreach (DataGridViewRow dr in dataGridView1.Rows) // trying to change all rows to orange
            dr.DefaultCellStyle.BackColor = Color.Orange;  // but it doesn't work

        dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Orange; // doesn't work
        dataGridView1.Refresh();
        dataGridView1.Update();

        dataGridView1.Columns[0].DefaultCellStyle.BackColor = Color.Beige; // this works


    }
}

Answer 1

Use the Datagridview CellPainting event. Just copy this code there.

        if (e.RowIndex == -1)
        {
            SolidBrush br= new SolidBrush(Color.Blue);
            e.Graphics.FillRectangle(br, e.CellBounds);
            e.PaintContent(e.ClipBounds);
            e.Handled = true;
        }
        else
        {
                SolidBrush br= new SolidBrush(Color.Orange);
                e.Graphics.FillRectangle(br, e.CellBounds);
                e.PaintContent(e.ClipBounds);
                e.Handled = true;

        }

The if checks if its a Header or not. Use the colors you want.. If you don´t want to paint the header just erase all the code inside the if.

I you want a gradient backcolor tell me..

EDIT:

Here is a code to paint pair rows in one color and impairs in another. You must use the Cellpainting event too..

else
        {
            if (e.RowIndex % 2 == 0)
            {
                SolidBrush br = new SolidBrush(Color.Gainsboro);

                e.Graphics.FillRectangle(br, e.CellBounds);
                e.PaintContent(e.ClipBounds);
                e.Handled = true;
            }
            else
            {
                SolidBrush br = new SolidBrush(Color.White);
                e.Graphics.FillRectangle(br, e.CellBounds);
                e.PaintContent(e.ClipBounds);
                e.Handled = true;
            }
        }

EDIT 2: Where the cellpainting event is?

Answer 2

Use DataGridView.RowsDefaultCellStyle to set background color for all rows:

dataGridView1.RowsDefaultCellStyle.BackColor = Color.Orange;

UPDATE (if you want to paint only some rows) you can use CellFormatting event:

void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (e.RowIndex > 2) // condition
        e.CellStyle.BackColor = Color.YellowGreen;
}

You can read more about changing DataGridView styles on msdn.

Answer 3

 Private Sub Coloriage()
    Dim fin As Integer = Gridarticles.Rows.Count - 1
    Dim i As Integer
    For i = 0 To fin
        If Gridarticles("stock", i).Value < 0 Then
            Gridarticles.Rows(i).DefaultCellStyle.BackColor = Color.Red
        ElseIf Gridarticles("stock", i).Value = 0 Then
            Gridarticles.Rows(i).DefaultCellStyle.BackColor = Color.Gray
        End If
    Next
End Sub