How to remove unwanted column at runtime from gridview?

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C#

ASP.NET

I am binding gridview by using datatable..i want to remove gridview column on specific condition.that is if any column have null value then that perticular column will be omitted from being displayed..

following code i have written on my .aspx page

<asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
        AllowSorting="True" AutoGenerateColumns="False" 
         Height="50px" EmptyDataText="No Records Found" 
                             
         Width="885px">
         
         <Columns>
         
         <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Sr") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                            
                        </asp:TemplateField>
                        
         <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Staffname") %>'></asp:Label>
                                </div>
                            </ItemTemplate>

                        </asp:TemplateField>
          <asp:TemplateField >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Exps1") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                           
                        </asp:TemplateField>
           <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Exps2") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                            
                        </asp:TemplateField>
           <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Exps2") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                            
                        </asp:TemplateField>
           <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Exps2") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                            
                        </asp:TemplateField>

         <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Exps3") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                            
                        </asp:TemplateField>
            <asp:TemplateField  >
                            <ItemTemplate>
                                <div class="gridcolstyle">
                                    <asp:Label ID="lblfid" runat="server" CssClass="labelstyle" Text='<%# bind("Exps4") %>'></asp:Label>
                                </div>
                            </ItemTemplate>
                            
                        </asp:TemplateField>

string str1 = "select * from ExpenseTrans";
           DataTable dt1 = db.GetDataTable(str1);
      
           if (dt1.Rows.Count > 0)
           {
               GridView1.DataSource = dt1;
               GridView1.DataBind();
}