Prevent Checkbox un/check in DataGridView from being toggled automatically

Question

I have a datagridview with a column checkbox

What i want is if a checkbox click (i use CellContentClick Event) I want show a messageBox that if user press ok .. then checkbox is checked and new query start. Else press Annul or Close Messagebox -> unchecked checkbox .

But i have a problem to implements..

   private void dgvApprovazione_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        try
        {

            if (dgvApprovazione.Rows[e.RowIndex].Cells[e.ColumnIndex] is DataGridViewCheckBoxCell)
            {
                CheckBox checkboxTmp = sender as CheckBox;

                checkboxTmp.AutoCheck = false;


            }


        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

EDIT--- I haven't access to design windows. Checkbox is a dinamyc column that is result of read DB. Fields in DB is a true/false type .. In datagridview i have checkbox with check or uncheck .

I want capture and prevent autocheck in 'code-time'

Sorry, now i'm specification ..... I'havent access at design time ... Because checkbox is a db result about a field (true/false). — rul3z

Reza Aghaei Reza Aghaei · Accepted Answer · 2016-03-30T13:19:07

You can make the column read only at start up or when you add the column using ReadOnly property of the column, then handle CelllContentClick and show the message box and set the value of cell based on message box result:

private void Form1_Load(object sender, EventArgs e)
{
    //Load data
    //Add columns

    //I suppose your desired coulmn is at index 0
    this.dataGridView1.Columns[0].ReadOnly = true;
}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    //I suppose your desired coulmn is at index 0
    if (e.ColumnIndex == 0 && e.RowIndex >= 0)
    {
        var result = MessageBox.Show("Check Item?", "", MessageBoxButtons.YesNoCancel);
        if (result == System.Windows.Forms.DialogResult.Yes)
        {
            ((DataGridView)sender)[e.ColumnIndex, e.RowIndex].Value = true;
        }
        else
        {
            ((DataGridView)sender)[e.ColumnIndex, e.RowIndex].Value = false;
        }
    }
}

There is not a real CheckBox in the cell and the sender of event is DataGridView.

Prevent Checkbox un/check in DataGridView from being toggled automatically

1 Answers