Question

I am working on a DataGridView called ListingGrid trying to activate / deactivate users that have been “checked” on any DataGridViewCheckBoxCell that is inside the DataGridViewCheckBoxColumn.

This is the way im trying to do that :

foreach (DataGridViewRow roow in ListingGrid.Rows)
{
    if ((bool)roow.Cells[0].Value == true)
    {
        if (ListingGrid[3, roow.Index].Value.ToString() == "True")
        {
            aStudent = new Student();
            aStudent.UserName = ListingGrid.Rows[roow.Index].Cells[2].Value.ToString();
            aStudent.State = true;
            studentList.Add(aStudent);

        }
    }
}

As far as I get, when you check a DataGridViewCheckBoxCell, the value of the cell is true right? But it is not allowing me to convert the value to bool and then compare it, throwing me an invalid cast exception.

Answer 1

try:

DataGridViewCheckBoxCell chkchecking = roow.Cells[0] as DataGridViewCheckBoxCell;

    if (Convert.ToBoolean(chkchecking.Value) == true)
{
}

or

DataGridViewCheckBoxCell chkchecking = roow.Cells[0] as DataGridViewCheckBoxCell;

        if ((bool)chkchecking.Value == true)
    {
    }