Checkbox column default value in data grid view

Question

I have a csv spec file I read into a List of strings. Then add it to a datagridview and add a checkbox column. I want to check all of the checkboxes, but nothing has worked. Tried looping through each row and setting the value to true, also tried to set the default values needed row event but no luck. Any ideas?

DataTable dtSpecs = new DataTable();

string[] tmpHeaders = specList[0].Split(','); 

foreach (var header in tmpHeaders)
{
    dtSpecs.Columns.Add(header, typeof(string));
}

for (int i = 1; i < specList.Count; i++)
{
    dtSpecs.Rows.Add(specList[i].Split(','));
}

dataGridView2.DataSource = dtSpecs;

DataGridViewCheckBoxColumn ckb2 = new DataGridViewCheckBoxColumn();
ckb2.HeaderText = "Enable";
ckb2.ValueType = typeof(bool);
dataGridView2.Columns.Insert(0, ckb2);

//This didn't work
for (int i = 0; i < dataGridView2.Rows.Count; i++)
{
    dataGridView2.Rows[i].Cells[0].Value = true;
}

//This way also didn't work
foreach (DataGridViewRow row in dataGridView2.Rows)
{
    row.Cells[0].Value = true;
}

//Also tried this but still nothing checked
private void dataGridView2_DefaultValuesNeeded(object sender, DataGridViewRowEventArgs e)
{
    e.Row.Cells[0].Value = true;
}

This code, work for me, can you please provide more code about your load page or other method in your page please. — Juan Ruiz de Castilla
– Juan Ruiz de Castilla, Commented Sep 2, 2015 at 23:32

Ivan Stoev · Accepted Answer · 2015-09-03 00:19:07Z

1

Don't mix UI and data. Since you are using a DataTable as a data storage for the grid, don't create a grid column, add a DataColumn to the data table instead. Like:

var dt = new DataTable();
dt.Columns.Add("Enable", typeof(bool));
var names = specList[0].Split(','); 
for (int c = 0; c < names.Length; c++)
    dt.Columns.Add(names[c]);
for (int i = 1; i < specList.Count; i++)
{
    var dr = dt.Rows.Add();
    dr[0] = true;
    var values = specList[i].Split(',');
    for (int c = 0; c < values.Length; c++)
        dr[1 + c] = values[c];  
}
dataGridView2.DataSource = dt;

answered Sep 3, 2015 at 0:19

Ivan Stoev

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