How to use multiselect in listview inside gridview

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C#

Hai friends,


I am populating sql table valus into listbox.It is in the <edititemtemplate> in the gridview.Suppose If I edit a row then i tried to select multiple option in list box.It is not updating multiple values in gridview.It is updating only the first selected value.How can I resolve this.Plz suggest the solutions for this.

ListBox3 is populating values from sql table.Below is the code

<asp:TemplateField HeaderText="ImpactedEntity">
  <ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Eval("ImpactedEntity") %>'></asp:Label>
  </ItemTemplate>
  <EditItemTemplate>
      <asp:ListBox ID="ListBox3" runat="server" AutoPostBack="True" SelectionMode="Multiple"></asp:ListBox>
  </EditItemTemplate>

  </asp:TemplateField>