Datagridview problem with passing the datasource

See more:

C#

Hello, I have a button that creates a new tabpage in a tabcontrol, a datagridview control in created tabpage. The data source of datagridview is a table with two columns, one with images(type byte[]) and one with a bool (it shows like a checkbox). So I want my second button to save the checked images, I tried passing the table with a selection changed event and mouse leave event but it doesen't work (it only saves the n-1 images that I want to save from n images checked for saving). So here is my question: How can I pass the datasource of datagridview after checking from button1 to button2 for saving? Or how can I find and work on datagridview control in created tabpage? Or is there any other way to do this? (int must be two buttons a created tabpage and a gatagridview control into one button and the saving part into the second)
And here is my code:

DataTable saveimgdataT;
private void button1_Click(object sender, EventArgs e)
{
    tabControl1.TabPages.RemoveByKey("Find Image");
    //create datagridview control
    DataGridView datagrid1 = new DataGridView();
    //create a new tabpage and add control
    Utile.Customtabpage.tabpage(tabControl1, datagrid1, "Find Image");
    // set data source
    datagrid1.DataSource = Utile.Results.addcheck(imlis, name, distance, M, N, ConnectionSTR);
    datagrid1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    datagrid1.SelectionChanged += new EventHandler(datagrid1_CheckChanged);
    datagrid1.AutoResizeColumns();
    datagrid1.AutoResizeRows();
}
void datagrid1_CheckChanged(object sender, EventArgs e)
{
    ((DataGridView)sender).Refresh();
    saveimgdataT = (DataTable)((DataGridView)sender).DataSource;


}

private void button2_Click(object sender, EventArgs e)
{
    if (!tabControl1.TabPages.ContainsKey("Find Image") == false)
    {
        tabControl1.SelectTab("Find Image");

        DataTable dt = saveimgdataT;
        FolderBrowserDialog save = new FolderBrowserDialog();
        if (save.ShowDialog() == DialogResult.OK)
        {
           Results.save(dt, save.SelectedPath);//function that saves the image
        }
    }
}