How can I get a value from a CheckBoxColumn using C# 3.0?

I can get the current selected row in this way:

 private void DataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e){

//Cells[0] cause CheckBoxColumn is in that index (first column)
DataGridViewCheckBoxCell temp = (DataGridViewCheckBoxCell)dgv.Rows[e.RowIndex].Cells[0];
}

So, Now I want to get all of the rows that have been checked by the user:

 foreach (var row_ in DataGridView1.Rows.OfType<DataGridViewRow>().
                                        Select(o => o.Cells.OfType<DataGridViewCheckBoxCell>().
                                         Where(r => r.Value.Equals(true))).FirstOrDefault()){

}

I am getting null reference from the debugger.

What am I doing wrong?

From stackoverflow

• I suspect you're going about it wrong, and what you actually meant to write is this:

  foreach (var row_ in
      DataGridView1.Rows.OfType<DataGridViewRow>().
      Where(o => o.Cells.OfType<DataGridViewCheckBoxCell>().
      Any(r => r.Value.Equals(true))))
  {
  
  }
  

  But I'm not certain.

  Angel Escobedo : Stills showing null reference.

• This is the answer, Hopes helps (Thanks mquander for the .Any idea):

          foreach (var _row in dgvpendientepago.Rows.OfType<DataGridViewRow>().
              Where(o => o.Cells.OfType<DataGridViewCheckBoxCell>().
                  Any(r => r.EditedFormattedValue.Equals(true))))
          {
            // do stuff like the following : 
            lst4Pay.Add(new Cobranzaciaseguro
            {
              numeroatencion = Convert.ToInt16(_row.Cells[3].Value),
              estado = 'P'
            });
          }