DataGridView checkbox column – value and functionality

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  1. There is no way to do that directly. Once you have your data in the grid, you can loop through the rows and check each box like this:

    foreach (DataGridViewRow row in dataGridView1.Rows)
{
    row.Cells[CheckBoxColumn1.Name].Value = true;
}

  2. The Click event might look something like this:

    private void button1_Click(object sender, EventArgs e)
{
    List<DataGridViewRow> rows_with_checked_column = new List<DataGridViewRow>();
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        if (Convert.ToBoolean(row.Cells[CheckBoxColumn1.Name].Value) == true)
        {
            rows_with_checked_column.Add(row);
        }
    }
    // Do what you want with the check rows
}

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