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How do I set the value of a bound checkbox to False?

Posted on 2007-12-04
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Last Modified: 2013-12-25
I have an order form in my ADO.Net app. On the form is a checkbox that I would like the CheckState to be set so its default value is "Fasle".  When the "ADd New" button is clicked, the checkbox has a highlighted green square in it. I would like this to be empty (False). I would like that value to automatically drop into the database when it is updated. I've tried:
Checkbox.CheckState = CheckState.Unchecked
I've also tried to set the default value in the databse column for "False" but this won't work either.
How do I set the value to be "False" ?

Thanks
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Question by:grouchyfd
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LVL 27

Expert Comment

by:VBRocks
ID: 20403320
Is the DataGridView bound to a DataSource?  

For example, do you set the DataSource to a DataTable or DataView, like this:
    Me.DataGridView1.DataSource = table

If you do, then you can just add a new row to the underlying table, and set the value before you add it.
Demonstration:
        'Example creating a DataTable to use as the source:
        Dim table As New DataTable()
        table.Columns.Add("IsSelected")
        table.Columns("IsSelected").DataType = GetType(Boolean)
        table.Columns.Add("Item")

        table.Rows.Add(False, "Item 1")

        Me.DataGridView1.DataSource = table


        'Example adding the new row:
        Dim table As DataTable
        table = Me.DataGridView1.DataSource

        Dim row As DataRow = table.NewRow()

        'Set the column to the Checked property in your Checkbox
        row("IsSelected") = Me.CheckBox1.Checked
        row("Item") = "Item 2"

        table.Rows.Add(row)


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LVL 27

Accepted Solution

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VBRocks earned 1500 total points
ID: 20403346
If your DataGridView is not bound to a DataSource as demonstrated above, then just use the
following approach:

    Me.DataGridView1.Rows.Add(Me.CheckBox1.Checked, "Item 1")

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Author Comment

by:grouchyfd
ID: 20403645
I have the controls on the form  in the "Details" mode, not the DataGridView so the CheckBox is box with a label on the form. I've use the code frmOrderForm.CheckBox.CheckState.Unchecked. When I put this in the intellisense tells me to enter it as CheckState. Unchecked but then this comes up a s error also.
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Author Comment

by:grouchyfd
ID: 20403689
I've gone into the table designer and changed the default property of the checkbox to "False". Then I get a different error when I try to update the database.
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Author Comment

by:grouchyfd
ID: 20404940
I finally solved the problem.
I went to my data source using the DataSource window, clicked on the dataset, then opened it by using the  "Edit DataSet with Designer". Clicked on the row of the cloumn I needed to change the default value of, which opened the Properties Window for this row and changed the "Default Value" to "False". Now every time a row is created for a new order, the default of "False" ( int 0) is automatically entered into the database cloumn.
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