How to Hide/show Command in gridView using role way Authorization

<asp:GridView ID="GridView1" runat="server" Height="16px" Width="72%"
               onrowcommand="GridView1_RowCommand" AutoGenerateColumns = "False"
                onrowdeleting="GridView1_RowDeleting" onrowediting="GridView1_RowEditing"
                onrowupdating="GridView1_RowUpdating" DataKeyNames="TaskID,TaskName"
                onrowcancelingedit="GridView1_RowCancelingEdit" CellPadding="4"
                ForeColor="Black" BackColor="#CCCCCC" BorderColor="#999999"
                BorderStyle="Solid" BorderWidth="3px" CellSpacing="2">
                <Columns>
                <asp:TemplateField HeaderText = "TaskID">
                <ItemTemplate>
                  <asp:Label ID="lblTaskID" runat="server" Text='<%# Eval("TaskID")%>'></asp:Label>
                  </ItemTemplate>
                  </asp:TemplateField>

                  <asp:TemplateField ItemStyle-Width = "100px"  HeaderText = "UserID">
           <ItemTemplate>
          <asp:Label ID="lblUserID" runat="server" Text='<%# Eval("UserID")%>'></asp:Label>
    </ItemTemplate>

<ItemStyle Width="100px"></ItemStyle>
    </asp:TemplateField>

    <asp:TemplateField  HeaderText = "TaskName">
    <ItemTemplate>
        <asp:Label ID="lblTaskName" runat="server"
                Text='<%# Eval("TaskName")%>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtTaskName" runat="server"
            Text='<%# Eval("TaskName")%>'></asp:TextBox>
    </EditItemTemplate>
    </asp:TemplateField>


    <asp:TemplateField   HeaderText = "TaskDesc">
    <ItemTemplate>
        <asp:Label ID="lblTaskDesc" runat="server"
                Text='<%# Eval("TaskDesc")%>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtTaskDesc" runat="server"
            Text='<%# Eval("TaskDesc")%>'></asp:TextBox>
    </EditItemTemplate>
</asp:TemplateField>

<asp:TemplateField   HeaderText = "ScriptName">
    <ItemTemplate>
        <asp:Label ID="lblScriptName" runat="server"
                Text='<%# Eval("ScriptName")%>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtScriptName" runat="server"
            Text='<%# Eval("ScriptName")%>'></asp:TextBox>
    </EditItemTemplate>
</asp:TemplateField>

<asp:TemplateField   HeaderText = "StartDate">
    <ItemTemplate>
        <asp:Label ID="lblStartDate" runat="server"
                Text='<%# Eval("StartDate")%>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtStartDate" runat="server"
            Text='<%# Eval("StartDate")%>'></asp:TextBox>
    </EditItemTemplate>
</asp:TemplateField>

<asp:TemplateField   HeaderText = "EndDate">
    <ItemTemplate>
        <asp:Label ID="lblEndDate" runat="server"
                Text='<%# Eval("EndDate")%>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtEndDate" runat="server"
            Text='<%# Eval("EndDate")%>'></asp:TextBox>
    </EditItemTemplate>
</asp:TemplateField>


<asp:TemplateField ItemStyle-Width="100px">
<EditItemTemplate>
<asp:LinkButton ID="imgbtnUpdate" CommandName="Update" runat="server"  ToolTip="Update" Height="20px" Width="20px" ><h2>Update</h2></asp:LinkButton>  &nbsp;&nbsp;&nbsp;&nbsp;
<asp:LinkButton ID="imgbtnCancel" runat="server" CommandName="Cancel"  ToolTip="Cancel" Height="20px" Width="20px"><h2>Cancel</h2></asp:LinkButton>
</EditItemTemplate>
<ItemTemplate >
<asp:LinkButton ID="imgbtnEdit" CommandName="Edit" runat="server"  ToolTip="Edit" Height="20px" Width="20px" ><h2>Edit</h2></asp:LinkButton>  &nbsp;&nbsp;
<asp:LinkButton ID="imgbtnDelete" CommandName="Delete" Text="Edit" runat="server"  ToolTip="Delete" Height="20px" Width="20px" ><h2>Delete</h2></asp:LinkButton>
</ItemTemplate>

<ItemStyle Width="120px"></ItemStyle>
</asp:TemplateField>
                    <asp:TemplateField HeaderText="Comment" ItemStyle-Width = "120px" >
                    <ItemTemplate>
                    <asp:LinkButton ID="LinkButton1" CommandName="abc" CommandArgument='<%#Eval("TaskID") %>' runat="server"><h2>Add Comment</h2></asp:LinkButton>
                    </ItemTemplate>

<ItemStyle Width="120px"></ItemStyle>
                    </asp:TemplateField>

                    <asp:TemplateField HeaderText="View Comment" ItemStyle-Width = "120px">
                    <ItemTemplate>
                    <asp:LinkButton ID="LinkButton3" CommandName="Xyz" OnClick="open" CommandArgument='<%#Eval("TaskID") %>'  runat="server"><h2>View Comment</h2> </asp:LinkButton>
                    </ItemTemplate>

                     <ItemStyle Width="120px"></ItemStyle>
                   </asp:TemplateField>
                </Columns>
                <FooterStyle BackColor="#CCCCCC" />
                <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalAlign="Left" />
                <RowStyle BackColor="White" />
                <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
                <SortedAscendingCellStyle BackColor="#F1F1F1" />
                <SortedAscendingHeaderStyle BackColor="#808080" />
                <SortedDescendingCellStyle BackColor="#CAC9C9" />
                <SortedDescendingHeaderStyle BackColor="#383838" />
            </asp:GridView>

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
   {
       if (e.CommandName == "abc")
       {
           Session["id"] = e.CommandArgument.ToString();
           Response.Redirect("Comment.aspx");
       }

   }