How to Add ItemTemplate of GridView using VB Code Behind

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Gridview

Good day to everyone.
can anybody help me with my codes?
I want to create a dynamic column in gridview..

My sample:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"   DataKeyNames="EmployeeID" DataSourceID="ObjectDataSource1">
     <columns>
        <asp:BoundField DataField="LastName" HeaderText="LastName"        SortExpression="LastName" />
        <asp:BoundField DataField="FirstName" HeaderText="FirstName"          SortExpression="FirstName" />
        <asp:BoundField DataField="Title" HeaderText="Title"          SortExpression="Title" />
        <asp:BoundField DataField="HireDate" HeaderText="HireDate"          SortExpression="HireDate" />
    </columns>

My problem is how to create a dynamic column. Meaning to say all data inside <column> will be created dynamically at code-behind. It can be either BoundField or by ItemTemplate (i prefer ItemTemplate please) the final code would be

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="EmployeeID" DataSourceID="ObjectDataSource1">
<column>
...all code here will be created at code behind...
</column>