How to know if the Check box is checked

Question

In a data grid view I need to loop on the rows and get the rows that contain a checked checkbox dgv.rows[i].cells[0].value is returning empty in the both cases all this is happening on the event CellContentClick

After I try a lot of thing I found that the problem is with the event because when I use another event the value is true. any Idea about another event that fire when I change the check of the checkbox? — Mario, Feb 21 '11 at 09:41
You need to post some code. We've all provided valid answers based on the information you've provided. Without the relevant code, there's not much else we can do. — Metro Smurf, Feb 21 '11 at 15:07

score 0 · Answer 1 · answered Feb 17 '11 at 14:42

0

Try:

'VB
Dim MyCheckBox As CheckBox = _
    CType(dgv.rows[i].cells[0].findcontrol("checkbox_id"), CheckBox)

C#:

//C#
CheckBox MyCheckBox =
    dgv.Rows[i].Cells[0].FindControl("checkbox_id") as CheckBox;

The Value property on a cell refers to text content when the cell doesn't contain any other controls.

answered Feb 17 '11 at 14:42

mellamokb

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the question is in C# code and your answers are for VB for info you don't have to use findControl you can use ((checkbox)dgv.rows[ind].cells[0].children[0]) – Mario Feb 17 '11 at 14:54

score 0 · Answer 2 · answered Feb 17 '11 at 16:58

0

If the checkbox does not contain any data, the result will be a null value. You can parse the value in your loop with a bool.Parse() assuming the value isn't null, i.e.,

for ( int i = 0; i < dgv.Rows.Count; i++ )
{
    var val = dgv.Rows[i].Cells[0].Value;
    if ( val == null ) { continue; }

    bool isChecked = bool.Parse( val.ToString() );
}

answered Feb 17 '11 at 16:58

Metro Smurf

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Metro I already said that dgv.Rows[i].Cells[0].Value is not working it return an empty string in both cases – Mario Feb 18 '11 at 09:20
@Mario - you also said `dgv.rows[ind].cells[0].children[0]` was a valid statement (refer to your comment to @mellamokb); there is no such property named `Children` on the `Cells` property. If the value is an empty string, then whatever you're using for binding is setting the value to empty. You should post all the relevant code. – Metro Smurf Feb 18 '11 at 15:03
please to read carefully the comment the property children exist in the **VB code** – Mario Feb 21 '11 at 09:38

score 0 · Answer 3 · answered Feb 19 '11 at 16:08

static class DataGridViewExtensions
{
    public static IEnumerable<DataGridViewRow> CheckedRows(this DataGridView dgv, string checkedColumnName)
    {
        return CheckedRows(dgv, dgv.Columns[checkedColumnName].Index);
    }

    public static IEnumerable<DataGridViewRow> CheckedRows(this DataGridView dgv, int checkedColumnIndex)
    {
        foreach (DataGridViewRow row in dgv.Rows)
        {
            DataGridViewCheckBoxCell cell = row.Cells[checkedColumnIndex] as DataGridViewCheckBoxCell;
            Debug.Assert(cell != null, "The column specified is not a check box column");
            if (cell != null && (bool)cell.Value)
                yield return row;
        }
    }
}

How to know if the Check box is checked

3 Answers3