How to add checkbox programatically in Gridview?

I'm able to add button programmatically, BUT not checkbox. Any ideas?
gvwInbox.AllowSorting = True
                gvwInbox.AllowPaging = True
                gvwInbox.PageSize = 10
                Dim btnView1 As ButtonField = New ButtonField()
                btnView1.ButtonType = ButtonType.Button
                btnView1.Text = "View"
                btnView1.CommandName = "View"
                Dim chk As CheckBoxField = New CheckBoxField
                chk.DataField = "subject"
                'Add in web controls
                gvwInbox.DataSource = objInbox.GetInbox(User.Identity.Name.ToString)

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Muhammad Ousama GhazaliConnect With a Mentor Solution Analyst & ArchitectCommented:
Right now you have declared only one TemplateField and most probably it will be the first if you are generating other columns automatically, hence making its index position within Columns or Cells collection 0. That is why my code has Cells(0) but in case you need to have more fields whether TemplateFields or BoundFields, make sure to pass the correct index postiion based upon the number of columns. Maybe the fact that I used the word ItemTemplates rather than TemplateFields has given wrong understanding above.
Muhammad Ousama GhazaliSolution Analyst & ArchitectCommented:
Make sure the database field set using DataField property of the CheckBoxField is a boolean field rather than a textual one, e.g. Bit (SQL Server) or Yes/No (Access). I just tested it here and it works with boolean fields only.
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Muhammad Ousama GhazaliSolution Analyst & ArchitectCommented:
You need to replace "Subject" with some other field like "IsCurrent" or whatever but a boolean field.
tangteng78Author Commented:
The links doesn't provide the insight on how to add checkbox programatically.
However, i put in the checkbox in the itemtemplate. See below.

how do i access the "subject" value if i selected on certain checkbox on a click of a button (the button defined separate outside of the gridview)?

    Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click

        For Each row As GridViewRow In gvwInbox.Rows

            Dim cb As CheckBox = row.FindControl("chk")
            'I'm stuck not know how to get the 'subject' value on specific checkbox checked.


    End Sub

<asp:GridView ID="gvwInbox" runat="server" AutoGenerateColumns="false" AllowSorting="true" >
                                    <asp:CheckBox ID="chk" runat="server" /></td>

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Muhammad Ousama GhazaliSolution Analyst & ArchitectCommented:
Please use the snippet below to get the checkbox, and then use its Checked property to evaluate if it is checked or not. Make sure if you use multiple ItemTemplates, pass the correct index position value into the Cells() collection.

Dim chkTemp As CheckBox = CType(row.Cells(0).FindControl("chk"), CheckBox)

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tangteng78Author Commented:
can you elaborate on this?

"Make sure if you use multiple ItemTemplates, pass the correct index position value into the Cells() collection."
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