if u wnat to put a red alert indicator in datagirdview column then u use the any symbol in header column and then u set hide and show of that indicator on depends upon the error comes in coding as u needed.

A sample from http://social.msdn.microsoft.com/Forums/en-US/winformsdatacontrols/thread/a44622c0-74e1-463b-97b9-27b87513747e/#page:2

is provided below.

private Point cellInError = new Point(-2, -2); 

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e) 
{ 
if (dataGridView1.IsCurrentCellDirty && !String.IsNullOrEmpty(e.ErrorText)) 
{ // paint everything except error icon e.Paint(e.ClipBounds, DataGridViewPaintParts.All & ~(DataGridViewPaintParts.ErrorIcon)); 
// now move error icon over to fill in the padding space GraphicsContainer container = e.Graphics.BeginContainer(); e.Graphics.TranslateTransform(18, 0);
 e.Paint(this.ClientRectangle, DataGridViewPaintParts.ErrorIcon); e.Graphics.EndContainer(container);
 e.Handled = true; 

} 

} 
private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
 {
 if (dataGridView1[e.ColumnIndex, e.RowIndex].ErrorText != String.Empty)
 { DataGridViewCell cell = dataGridView1[e.ColumnIndex, e.RowIndex]; cell.ErrorText = String.Empty; cellInError = new Point(-2,-2); 
// restore padding for cell. This moves the editing control cell.Style.Padding = (Padding)cell.Tag; 
// hide and dispose tooltip 
if (errorTooltip != null)
 { 
errorTooltip.Hide(dataGridView1); errorTooltip.Dispose();
 errorTooltip = null; }
 }
 }

Ha--I wonder if it's a homework assignment.

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