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To draw a row in a DataGridView control in a different style depending on a certain condition, you can use the RowPrePaint event to interrupt the painting of the rows in the grid.
You then have a choice of which parts of the row to be painted automatically and which parts to paint yourself via the PaintParts event property.
In the code below, I paint a row with a custom brush, depending on the value of a column that is named 'Error'.
1: /// <summary>
2: /// Handles the drawing of each DataGridView row depending on set log error state.
3: /// </summary>
4: /// <param name="sender"></param>
5: /// <param name="e"></param>
6: private void setLogDataGridView_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
7: {
8: // Paint all parts of row except SelectionBackground and the Focus box.
9: e.PaintParts = DataGridViewPaintParts.All & ~(DataGridViewPaintParts.SelectionBackground | DataGridViewPaintParts.Focus);
10:
11: // Get the value of the error column of the current row
12: string val = this.setLogDataGridView.Rows[e.RowIndex].Cells["Error"].Value.ToString();
13:
14: if (val != "0")
15: {
16: // Get rectangle of area to paint with custom brush.
17: Rectangle rowBounds = new Rectangle(
18: this.setLogDataGridView.RowHeadersWidth, e.RowBounds.Top,
19: this.setLogDataGridView.Columns.GetColumnsWidth(
20: DataGridViewElementStates.Visible) -
21: this.setLogDataGridView.HorizontalScrollingOffset + 1,
22: e.RowBounds.Height);
23:
24: // Disable normal painting of backgrounds.
25: e.PaintParts &= ~(DataGridViewPaintParts.Background | DataGridViewPaintParts.ContentBackground);
26:
27: e.PaintHeader(false);
28:
29: // Paint the custom background.
30: using (Brush lgb = new LinearGradientBrush(rowBounds, Color.Red,
31: Color.DarkRed, LinearGradientMode.Vertical))
32: {
33: e.Graphics.FillRectangle(lgb, rowBounds);
34: }
35:
36: // Set the text colour.
37: this.setLogDataGridView.Rows[e.RowIndex].DefaultCellStyle.ForeColor = Color.Yellow;
38: this.setLogDataGridView.Rows[e.RowIndex].DefaultCellStyle.SelectionForeColor = Color.Yellow;
39: }
40: }
