Question

How can i check for the bool condition of a check box which is in datagridview. I would like to have true if checked and false if it was unchecked. Can any one help me.

Is it possible to handle this in dataGridView_CellContentClick

Answer 1

This is addressed a little bit on the MSDN pages for the DataGridView here and here.

In particular they say:

For clicks in a DataGridViewCheckBoxCell, this event occurs before the
check box changes value, so if you do not want to calculate the
expected value based on the current value, you will typically handle
the DataGridView.CellValueChanged event instead. Because that event
occurs only when the user-specified value is committed, which
typically occurs when focus leaves the cell, you must also handle the
DataGridView.CurrentCellDirtyStateChanged event. In that handler, if
the current cell is a check box cell, call the DataGridView.CommitEdit
method and pass in the Commit value.

So they recommend against using the CellClick type events (since they never push the value until you leave the cell) but instead use CurrentCellDirtyStateChanged and the CommitEdit method.

So you end up with:

dataGridView1.CurrentCellDirtyStateChanged += new EventHandler(dataGridView1_CurrentCellDirtyStateChanged);
dataGridView1.CellValueChanged += new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);

void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (dataGridView1.Columns[e.ColumnIndex].Name == "CB")
    {
        MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString());    
    }
}

void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
    dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
}

And as for getting the checked value – this is just the Value property of the DataGridViewCheckBoxCell.

So if you go:

dataGridView1.Rows[rowindex].Cells[cellindex].Value 

you get a boolean value which corresponds to the checkbox (after the change has been committed).