Three buttons and one gridview

Use a RadioButtonList, set AutoPostBack True and add SelectedIndexChanged event. Then based on the SelectedValue populate GridView

use RadioButtonList set autoPostback true and  then  on

OnSelectedIndexChanged event

do following coding

 protected void PupulateGrid(object sender, EventArgs e)    {
        switch (RadioButtonList1.SelectedItem.Value)        {
            case "1":                GridView1.DataSource = "";
                GridView1.DataBind();                break;            case "2":
                GridView1.DataSource = "";                GridView1.DataBind();
                break;            case "3":
                GridView1.DataSource = "";                GridView1.DataBind();
                break;        }        }

Thanks for your reply I am out of the office until Wednesday I will try it then and get back to you.

Okay I'm confused...

I added the radiobuttonlist

 <span class="style1"><strong>                 <br />
                 <asp:RadioButtonList ID="Pending" runat="server" AutoPostBack="True">
                     <asp:ListItem Value="300">Over 300</asp:ListItem>
                     <asp:ListItem Value="350">Over 350</asp:ListItem>
                     <asp:ListItem Value="400">Over 400</asp:ListItem>
                 </asp:RadioButtonList>        <br />
        DDS Pending Cases over 250 Days 
                 based on File Date<br />
        </strong></span>          <%--
        <span class="style4"><span class="style1"><strong>Total Pending:</strong></span> </span>
      <asp:Label runat="server" id="CountLabel" Font-Bold="True" class="style2" CssClass="style1" />
--%> <br /> 
         <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataSourceID="SqlDataSource7" EnableModelValidation="True" Width="331px" 
        CaptionAlign="Top" Height="126px" BackColor="White" BorderColor="#DCBE68" 
             BorderStyle="Solid" BorderWidth="1px" CellPadding="4" 
              HorizontalAlign="Center" CellSpacing="2" Font-Names="Arial" 
     AllowSorting="True">                           <Columns>
                               <asp:BoundField DataField="Doc" HeaderText="DDS" SortExpression="Doc" />
                               <asp:TemplateField HeaderText="Total Pending" SortExpression="cnt">
                                    <ItemTemplate>
                           <asp:HyperLink ID="HyperLink1" runat="server" 
                            NavigateUrl='<%# "PendingDDS.aspx?doc=" & Eval("doc") %>' 
                            Text='<%# Eval("cnt") %>'></asp:HyperLink>
                        </ItemTemplate>                                 
                                   <HeaderStyle Wrap="False" />
                               </asp:TemplateField>
                           </Columns>
                          <FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" 
            VerticalAlign="Top" Font-Size="Medium" />
        <PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
        <RowStyle BackColor="White" BorderStyle="Double" ForeColor="#330099" 
                  HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
    </asp:GridView>   

Then I added this:

  Protected Sub Pending_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles Pending.SelectedIndexChanged
        If Pending.SelectedItem.Value = "300" Then            GridView1
        ElseIf Pending.SelectedItem.Value = "350" Then            GridView1
        ElseIf Pending.SelectedItem.Value = "400" Then            GridView1
        End If    End Sub

What do I add where Gridview is located?

You need to call the database with the value selected from the radiobuttonlist and then populated and bind the gridview.

Since the value from the radiobuttonlist will make difference in the data that is being populated