I have encountered the following issue :

I have a DataGridView control on a windows form with a checkbox column. When
the user clicks the column header, I need to toggle the selected state of the
checkboxes...basically a 'select/deselect all'.

Everything is working fine, except the checkbox in the very first row does
not show the check mark unless i actually click the control itself. rows 1
thru n work fine. I have verified that the value is being set on the first
row's checkbox, so it seems to be a display issue. Here is the code:

void grdDirectReports_ColumnHeaderMouseClick(object sender,
DataGridViewCellMouseEventArgs e)
{

DataGridView dgv = (DataGridView)sender;

if (e.ColumnIndex == dgv.Columns["Selected"].Index)
{
if (e.RowIndex < 0)
{
for (int i = 1; i < dgv.Rows.Count; i++)
{
dgv.Rows[i].Cells[0].Value =
!lastDRGridCheckAllSelected;
}
lastDRGridCheckAllSelected = !lastDRGridCheckAllSelected;

dgv.Refresh();
}
}
}

You are starting at row 1 instead of row 0 in your for loop, try this:
void grdDirectReports_ColumnHeaderMouseClick(object sender,
DataGridViewCellMouseEventArgs e)
{

DataGridView dgv = (DataGridView)sender;

if (e.ColumnIndex == dgv.Columns["Selected"].Index)
{
if (e.RowIndex < 0)
{
for (int i = 0; i < dgv.Rows.Count; i++)
{
dgv.Rows[i].Cells[0].Value =
!lastDRGridCheckAllSelected;
}
lastDRGridCheckAllSelected = !lastDRGridCheckAllSelected;

dgv.Refresh();
}
}
}


"Pete" wrote:

> I have encountered the following issue :
>
> I have a DataGridView control on a windows form with a checkbox column. When
> the user clicks the column header, I need to toggle the selected state of the
> checkboxes...basically a 'select/deselect all'.
>
> Everything is working fine, except the checkbox in the very first row does
> not show the check mark unless i actually click the control itself. rows 1
> thru n work fine. I have verified that the value is being set on the first
> row's checkbox, so it seems to be a display issue. Here is the code:
>
> void grdDirectReports_ColumnHeaderMouseClick(object sender,
> DataGridViewCellMouseEventArgs e)
> {
>
> DataGridView dgv = (DataGridView)sender;
>
> if (e.ColumnIndex == dgv.Columns["Selected"].Index)
> {
> if (e.RowIndex < 0)
> {
> for (int i = 1; i < dgv.Rows.Count; i++)
> {
> dgv.Rows[i].Cells[0].Value =
> !lastDRGridCheckAllSelected;
> }
> lastDRGridCheckAllSelected = !lastDRGridCheckAllSelected;
>
> dgv.Refresh();
> }
> }
> }
>

[BindraBindu]

Hello Everyone,
For complete information about datagrdiview checkbox using c#, you may check out the following links!!!!!

http://mindstick.com/Articles/77b73d...20DataGridView

Thanks !!!!