Row not opening in edit mode on pressing edit in Gridview asp.net vb

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ASP.NET

hi all,

I have created a databound grid view in a web application and trying to edit the rows throught each row's edit button. But on pressing the edit button the row is still fix and edit is not allowed. Though the Update and cancel button appears.

following is code in vb

Protected Sub DataGridView1_RowEditing(sender As Object, e As GridViewEditEventArgs) Handles DataGridView1.RowEditing
        DataGridView1.EditIndex = e.NewEditIndex
        Call fnShowBom()***(function to call data from sql and bind the grid)

    End Sub

Thanks in advance

gridview code:

<asp:GridView ID="DataGridView1"
       runat="server"
       AutoGenerateColumns="false"
       DataKeyNames="BOMIC"
       showfooter="true"
       enablesorting="true"
       CssClass="Grid"
       AllowSorting="True"
       BorderStyle="Groove"
       onrowcancellingedit="datagridview1_rowcancellingedit"
       onrowdatabound="DataGridView1_RowDataBound"
       onrowediting="DataGridView1_RowEditing"
       onrowupdating="DataGridView1_RowUpdating"
       onrowcommand="DataGridview1_Rowcommand"
       onrowdeleting="DataGridView1_RowDeleting"
       onselectedindexchanged="DataGridView1_SelectedIndexChanged"
       >
      <HeaderStyle CssClass="GridHeader" />
       <RowStyle CssClass="GridItem" />
       <AlternatingRowStyle CssClass="GridAltItem" />

       <Columns>
           <asp:TemplateField HeaderText="Item Code"  HeaderStyle-HorizontalAlign="Left">
               <EditItemTemplate>
                   <asp:Label ID="BOMIC" runat="server" Text='<%# Bind("BOMIC")%>'></asp:Label>
               </EditItemTemplate>
               <ItemTemplate>
                   <asp:Label ID="BOMIC" runat="server" Text='<%# Bind("BOMIC") %>'></asp:Label>
               </ItemTemplate>
           </asp:TemplateField>

            <asp:TemplateField HeaderText="Description"  HeaderStyle-HorizontalAlign="Center">
               <EditItemTemplate>
                   <asp:Label ID="BOMIN" runat="server" Text='<%# Bind("BOMIN")%>'></asp:Label>
               </EditItemTemplate>
               <ItemTemplate>
                   <asp:Label ID="BOMIN" runat="server" Text='<%# Bind("BOMIN") %>'></asp:Label>
               </ItemTemplate>
           </asp:TemplateField>

           <asp:TemplateField HeaderText="Qty"  HeaderStyle-HorizontalAlign="Center">
               <EditItemTemplate>
                   <asp:Label ID="BOMIQ" runat="server" Text='<%# Bind("BOMIQ")%>'></asp:Label>
               </EditItemTemplate>
               <ItemTemplate>
                   <asp:Label ID="BOMIQ" runat="server" Text='<%# Bind("BOMIQ")%>'></asp:Label>
               </ItemTemplate>
           </asp:TemplateField>

           <asp:TemplateField HeaderText="Vendor"  HeaderStyle-HorizontalAlign="Center">
               <EditItemTemplate>
                   <asp:Label ID="BOMIV" runat="server" Text='<%# Bind("BOMIV")%>'></asp:Label>
               </EditItemTemplate>
               <ItemTemplate>
                   <asp:Label ID="BOMIV" runat="server" Text='<%# Bind("BOMIV")%>'></asp:Label>
               </ItemTemplate>
           </asp:TemplateField>


           <asp:TemplateField HeaderText="Page No."  HeaderStyle-HorizontalAlign="Center">
               <EditItemTemplate>
                   <asp:Label ID="BOMIRM" runat="server" Text='<%# Bind("BOMIRM")%>'></asp:Label>
               </EditItemTemplate>
               <ItemTemplate>
                   <asp:Label ID="BOMIRM" runat="server" Text='<%# Bind("BOMIRM")%>'></asp:Label>
               </ItemTemplate>
           </asp:TemplateField>

           <asp:TemplateField HeaderText="Edit" ShowHeader="False" HeaderStyle-HorizontalAlign="Left">
               <EditItemTemplate>
                   <asp:LinkButton ID="lnkUpdate" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton>
                   <asp:LinkButton ID="lnkCancel" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
               </EditItemTemplate>
               <FooterTemplate>
                   <asp:LinkButton ID="lnkAdd" runat="server" CausesValidation="False" CommandName="Insert" Text="Insert"></asp:LinkButton>
               </FooterTemplate>
               <ItemTemplate>
                   <asp:LinkButton ID="lnkEdit" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit"></asp:LinkButton>
               </ItemTemplate>
           </asp:TemplateField>

           <asp:CommandField HeaderText="Delete" ShowDeleteButton="True" ShowHeader="True" />


      </Columns>

   </asp:GridView>