Question

I have a bunch of controls in a tab control on a windows form. Some of the controls are data bound. I’m attempting to access the values of the controls but some of the controls seem to not have values until i physically navigate to the form that has the control. When are controls data bound? Do they have to be displayed first before the values are actually set?

Answer 1

I had accurately same problem,whenever i wanted to read combobox default value from unnanvigated tabpages was returning null,and i founddatabanding occures aftercontrol show,
and what i did ,was writing this function

protected virtual void SetComboData(System.Windows.Forms.Control parentCtrl, DataRow r)
{
    foreach (System.Windows.Forms.Control ctrl in parentCtrl.Controls)
    {
        if (ctrl is ComboBox)
            if ((ctrl as ComboBox).DataBindings.Count != 0)
                (ctrl as ComboBox).SelectedValue = r[(ctrl as ComboBox).DataBindings[0].BindingMemberInfo.BindingMember];
        if (ctrl is TextBox)
            if ((ctrl as TextBox).DataBindings.Count != 0)
                (ctrl as TextBox).Text = r[(ctrl as TextBox).DataBindings[0].BindingMemberInfo.BindingMember].ToString();
        SetLecData(ctrl, r);
    }
}

and i was calling the function before saving dataset

 SetComboData(tabControl1, MyDataSet.Table["MyTable"]);//for tabcontrol