Dynamically adding checkbox in datagridview and selecting full rows by checking checkbox and getting all selected rows from button click

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C#

.NET4.5

Hello, I have added checkbox dynamically and I am enable to select full rows by checked the checkbox but, I couldn't deselect rows by unchecked the checkbox in DataGridView.

And, I have a button, where I want to show message only selected checkbox.

My Code for Dynamically adding Checkbox in DataGridView:

DataGridViewCheckBoxColumn checkColumn = new DataGridViewCheckBoxColumn();
             
            this.dtgrid_event_list.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;

            checkColumn.Name = "Check";
            checkColumn.HeaderText = "Check";
            checkColumn.Width = 50;
            checkColumn.FillWeight = 50;
            this.dtgrid_event_list.Columns.Add(checkColumn);
            this.dtgrid_event_list.AllowUserToAddRows = false;
            this.dtgrid_event_list.AllowUserToDeleteRows = false;
            
            this.dtgrid_event_list.DataSource = db.Adapter("select device, event_name, frame, frame_rate, event_duration from alb_events");

My Selection Row Code:

private void dtgrid_event_list_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 0 && e.RowIndex != -1)
            {
                string point = "";
                Color oldColor = this.dtgrid_event_list.Rows[e.RowIndex].DefaultCellStyle.SelectionBackColor;
                this.dtgrid_event_list.Rows[e.RowIndex].DefaultCellStyle.SelectionBackColor = Color.FromArgb(oldColor.R < 235 ? oldColor.R + 20 : 0,
                                    oldColor.G, oldColor.B);
                foreach (DataGridViewRow drv in this.dtgrid_event_list.Rows)
                {
                    DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)drv.Cells[0];
                    

                    foreach (DataGridViewCell cell in drv.Cells)
                    {
                        if (drv.Index == e.RowIndex)
                        {
                            if (chk.Value == chk.TrueValue)
                            {
                                cell.Style.BackColor = Color.BlueViolet;
                               
                            }
                                
                            if (cell.ColumnIndex == 4)
                            {
                                if(cell.Value.ToString().Length > 2)
                                    point = cell.Value.ToString().Substring(2, 1).ToString();
                                
                            }
                            if (point == ".")
                                cell.Style.BackColor = Color.Red;

                           
                                

                        }

                    }
                }
            }
        }

Now, Please help me to deselect row by unchecked Checkbox and Show Only selected Rows by clicking in Button.

What I have tried:

private void btnAddEvent_Click(object sender, EventArgs e)
{
int count = 1;
foreach (DataGridViewRow drv in this.dtgrid_event_list.Rows)
{
DataGridViewCheckBoxCell chkchecking = new DataGridViewCheckBoxCell();
chkchecking= (DataGridViewCheckBoxCell)drv.Cells[0];
MessageBox.Show(chkchecking.Value.ToString());

if ((bool)chkchecking.Value == true)
{
MessageBox.Show(count.ToString());
}

count = count + 1;
}
}