How to count checked checkboxes in DataGridView when Checkbox value is changed in c#?

Question

I was unable to count checked checkboxes in DataGridView. I want to count the checked checkboxes during the checkbox is checked and store the number of checked items in a label. I tried the following code but does not give the correct count:

    int num = 0;
    private void dgvLoadData_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        bool isChecked = Convert.ToBoolean(dgvLoadData.Rows[dgvLoadData.CurrentCell.RowIndex].Cells[0].Value.ToString());

        if (isChecked)
        {
            num+=1;
        }
        else
        {
            num-=1;
        }

        labelSelectedSum.Text = "Selected Items: " + num;
    }

when these checkboxes are getting checked? just when the datagridview is bound with data? — renakre
– renakre, Commented Apr 7, 2015 at 3:15
Have a look at the following @Michay. stackoverflow.com/questions/1237829/… and also codeproject.com/Articles/42437/… — James Shaw
– James Shaw, Commented Apr 7, 2015 at 3:15
your code appears to only work with a single row, returning 1 if the cell is checked, and -1 if it is not. As you are only working with a single row, how do you expect to get a count of anything? — Sam Axe
– Sam Axe, Commented Apr 7, 2015 at 3:17
@Grant Winney: I tried moving the num outside the event but still doesn't give the correct count. . . — ThEpRoGrAmMiNgNoOb
– ThEpRoGrAmMiNgNoOb, Commented Apr 7, 2015 at 3:28

titol · Accepted Answer · 2020-10-15 08:08:14Z

4

Apply CurrentCellDirtyStateChanged event on the table. Call gridview.CommitEdit to update value of the checkbox column. Do the following:

private void dgvLoadData_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
    if (dgvLoadData.IsCurrentCellDirty)
    {
        dgvLoadData.CommitEdit(DataGridViewDataErrorContexts.Commit);
    }
}

That will call _CellValueChanged event. No changes will be done on the codes inside CellValueChanged event:

int num = 0;
private void dgvLoadData_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex < 0)
            return;
    bool isChecked = (bool)dgvItemsToShip.Rows[e.RowIndex].Cells[0].Value;

    if (isChecked)
    {
        num+=1;
    }
    else
    {
        num-=1;
    }

    labelSelectedSum.Text = "Selected Items: " + num;
}

edited Oct 15, 2020 at 8:08

titol

1,14916 silver badges28 bronze badges

answered Apr 30, 2015 at 7:02

ThEpRoGrAmMiNgNoOb

1,3243 gold badges25 silver badges47 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

dbc Over a year ago

As suggested by @titol in a proposed edit, consider checking for (e.RowIndex < 0) as shown in Index out of range exception in datagridview when header is selected.

yeisonherbert · Accepted Answer · 2015-12-05 22:04:22Z

You can use the event: CellContentClick and CellContentDoubleClick:

Good Luck!

int num = 0;
    private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        bool isChecked = (bool)dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].EditedFormattedValue;
        CheckCount(isChecked);
    }
    private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
        bool isChecked = (bool)dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].EditedFormattedValue;
        CheckCount(isChecked);
    }
    private void CheckCount(bool isChecked)
    {
        if (isChecked)
        {
            num++;
        }
        else
        {
            num--;
        }
        labelSelectedSum.Text = "Selected Items: " + num;
    }

Fred Smith · Accepted Answer · 2016-07-29 09:55:16Z

0

I have a DataTable bound to my DataGridView and I check if the first column has any checkbox checked Here is my example :

private void dataGridViewMain_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
  if (e.ColumnIndex == 0)
  {
    int numberOfRow = dataTableCsvFile.AsEnumerable().Count(r => r[0].ToString() == true.ToString());
    buttonDataGridviewVerify.Enabled = numberOfRow > 0;
  }
}

answered Jul 29, 2016 at 9:55

Fred Smith

2,1493 gold badges27 silver badges39 bronze badges

Collectives™ on Stack Overflow

How to count checked checkboxes in DataGridView when Checkbox value is changed in c#?

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related