datagridviewcheckboxcell

I have DataGridView bound by a datatable i have checkboxes to the same. I want to navigate or loop through the the datagridview and check mark these checkboxes ,Below is the syntax i use . foreach(DataGridViewRow dr in dgvColumns.Rows) { DataGridViewCheckBoxCell checkCell = (DataGridViewCheckBoxCell)dr.Cells["CheckBoxes"]; checkCell.Value=1; //Also tried checkCell.Selected=true; //Nothing seems to have worked.! } The following worked for me, it checked the checkboxes perfectly :) foreach (DataGridViewRow row in dgvDataGridView.Rows) { ((DataGridViewCheckBoxCell)row.Cells[0]).Value = true; } If

So I have seen several posts here and I have tried every solution to no avail. I have tried several examples all over the web and nothing has worked. It's taunting me! The below code is what I'm running now which I feel should work but it doesn't. The problem is if the value is not true or false then it blows up with invalid cast because the value is displayed as {}. If the value is true then it's never identified as true where cell.Value = cell.TrueValue. I set TrueValue and FalseValue in the datagridview setup as true and false respectively. What have I missed? DataGridViewCheckBoxCell cell

GOOD BAD I'm hosting different controls in DataGridView column. When I add controls at the same time I initialize the grid the controls show as Textboxes (BAD). If I add the controls after the DataGridView has been initialized controls render correctly (GOOD). public Form1() { InitializeComponent(); ControlsInGridViewColumn(); //<- renders controls as textboxes } private void button1_Click(object sender, EventArgs e) { ControlsInGridViewColumn(); //<- does correctly render controls } private void ControlsInGridViewColumn() { DataTable dt = new DataTable(); dt.Columns.Add("name"); for (int j =