C# Datagridvew checkbox value

Question

I want to get a checkbox value from a datagridview(True/False) but I always get a value "null", here is the code where i get the value of the checkbox:

DataGridViewCheckBoxCell boolean = (DataGridViewCheckBoxCell)dgv[e.ColumnIndex, e.RowIndex];
string checkCheckboxChecked = ((bool)boolean.FormattedValue) ? "False" : "True";

This code returns a false in the Boolean.FormattedValue even the checkbox is checked and also I tried another:

object value = dgvVisual[e.ColumnIndex, e.RowIndex].Value;

And this code return a value of null

Why does this happen?

P.S. e is an event of the CELL CONTENT CLICK.

Here is the full code of the datagridview cell content click:

private void dgvVisual_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    int Number1= int.Parse(dgvVisual[0, e.RowIndex].Value.ToString());
    int Number2 = (e.ColumnIndex - 1);                
    DataGridViewCheckBoxCell boolean = (DataGridViewCheckBoxCell)dgvVisual[e.ColumnIndex, e.RowIndex];
    bool checkCheckboxChecked = (null != boolean && null != boolean.Value && true == (bool)boolean.Value);
    //string checkCheckboxChecked = "";
    if (checkCheckboxChecked)
    {
        //do something if the checkbox is checked
    }
    else
    {
        //do something if the checkbox isn't
    }
}

SOLVED: I changed the CELL END EDIT EVENT and add the click content to datagridview.CurrentCell to another cell.

NULL Reference exception if i use dgvVisual[e.ColumnIndex, e.RowIndex].Value.toString(); — User2012384, Jul 21 '12 at 02:16
Since you are using an eventargs which DataGridView event is this code in? — Mark Hall, Jul 21 '12 at 02:23
Problem sovled using the CELL END EDIT event but it's weird as the user have to click another cell after clicking the checkbox on the original one — User2012384, Jul 21 '12 at 02:36
Try the `DataGridView.CellValueChanged` event I'm thinking it might do the trick. — DROP TABLE users, Jul 21 '12 at 03:59

score 1 · Accepted Answer · edited Apr 08 '13 at 10:30

1

Its a bit odd calling the cell boolean. And then using its FormattedValue property. I added a DataGridView to a Form, added two columns Text and Checkbox. CheckBox is a DataGridViewCheckBoxColumn. Then I added a button and this should give you the idea:

private void button1_Click(object sender, EventArgs e)
{
    dgv.AutoGenerateColumns = false;
    DataTable dt = new DataTable();
    dt.Columns.Add("Text");
    dt.Columns.Add("CheckBox");
    for (int i = 0; i < 3; i++)
    {
        DataRow dr = dt.NewRow();
        dr[0] = i.ToString();
        dt.Rows.Add(dr);
    }
    dgv.DataSource = dt;            
}

private void dgv_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    foreach (DataGridViewRow row in dgv.Rows)
    {
        var oCell = row.Cells[1] as DataGridViewCheckBoxCell;
        bool bChecked = (null != oCell && null != oCell.Value && true == (bool)oCell.Value);
    }
}

edited Apr 08 '13 at 10:30

Rob

4,927
12
49
54

answered Jul 21 '12 at 02:08

Jeremy Thompson

61,933
36
195
321

is OCELL a DataGridViewCheckBoxCell? – User2012384 Jul 21 '12 at 02:13
This doesn't work also, It returns a "FALSE" value even the checkbox is checked – User2012384 Jul 21 '12 at 02:18
It doesn't work for me also...is it that i blind the data from the database and i changed the Column's data property name? – User2012384 Jul 21 '12 at 02:40

C# Datagridvew checkbox value

1 Answers1