Hi Jignesh,

Thank you for your reply!

> I would like to initialize controls with default values and because of this odd behaviour it causes troubles.

If you're using DataSet/DataTable as the underlying data source, I recommend you to set the default value of the column in the DataTable rather than set the Text property of the bound TextBox directly.

To do this, open the DataSet in the designer and selec the DataTable in question. Set the DefaultValue property of the columns you want in the DataTable in Properties window.

If you're using list that contains instances of custom type as the underlying data source, handle the AddingNew event of the BindingSource component to set the default value. For example:

public class Person
{
private string name;
public string Name
{
get { return name; }
set { name = value; }
}
}
BindingSource bs = new BindingSource();

private void Form1_Load(object sender, EventArgs e)
{
List<Person> list = new List<Person>();
bs.DataSource = list;
bs.AddingNew += new AddingNewEventHandler(bs_AddingNew);
this.textBox1.DataBindings.Add("Text", bs, "Name");
}

void bs_AddingNew(object sender, AddingNewEventArgs e)
{
Person obj = new Person();
obj.Name = "new name";
e.NewObject = obj;
}
> I have some similar issue with DataGridView Control, if you know solution for this second issue, let me know.

As franking has suggested, you can subscribe the DefaultValueNeeded event of the DataGridView and in the event handler check the first item in the DataGridViewComboBoxColumn's DataSource and set that value as the default value of the cell.

Hope this helps.
If you have any question, please feel freeto let me know.

Sincerely,
Linda Liu

Hi Jignesh,

I performed a test based on your description and did reproduce the problem on my side.

When a control is newed, it is not created at this time. Only after this control is added to a form or a container AND this container is visible, this control will be created. In your scenario, since the controls are added to the second TabPage which is not visible when the form is loaded, these controls will not be created until the second TabPage is made visible.

I have tried set the Visible property of the TextBox which is added to the second TabPage to true in the form's Load event handler, but without success. The TextBox's Visible property remains false until the second TabPage is visible.

So this behavior is by design and there doesn't seem to be a workaround.

Anyway, I don't think this behavior would cause any problem.

If you have any concern, please feel free to let me know.

Sincerely,
Linda Liu

Hi Jignesh,

Thank you for your reply!

> I would like to initialize controls with default values and because of this odd behaviour it causes troubles.

If you're using DataSet/DataTable as the underlying data source, I recommend you to set the default value of the column in the DataTable rather than set the Text property of the bound TextBox directly.

To do this, open the DataSet in the designer and selec the DataTable in question. Set the DefaultValue property of the columns you want in the DataTable in Properties window.

If you're using list that contains instances of custom type as the underlying data source, handle the AddingNew event of the BindingSource component to set the default value. For example:

public class Person
{
private string name;
public string Name
{
get { return name; }
set { name = value; }
}
}
BindingSource bs = new BindingSource();

private void Form1_Load(object sender, EventArgs e)
{
List<Person> list = new List<Person>();
bs.DataSource = list;
bs.AddingNew += new AddingNewEventHandler(bs_AddingNew);
this.textBox1.DataBindings.Add("Text", bs, "Name");
}

void bs_AddingNew(object sender, AddingNewEventArgs e)
{
Person obj = new Person();
obj.Name = "new name";
e.NewObject = obj;
}
> I have some similar issue with DataGridView Control, if you know solution for this second issue, let me know.

As franking has suggested, you can subscribe the DefaultValueNeeded event of the DataGridView and in the event handler check the first item in the DataGridViewComboBoxColumn's DataSource and set that value as the default value of the cell.

Hope this helps.
If you have any question, please feel freeto let me know.

Sincerely,
Linda Liu

HiLinda Liu

Your Suggestion Works!

Thanks
JIGNESH