How to delete a row from GridView in ASP.Net

Hi 

i am using the textbox and button to search for user by UID and if i click on the button then the gridview will show the user information, i just would like to know how i can delete the row.

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
                    <ContentTemplate>
                    

                   <div class="banersboxinsrtUsrSrch">
                       <asp:TextBox ID="srchuserTxtBox" runat="server"></asp:TextBox>&nbsp;&nbsp; 
                       <asp:Button ID="srchuserbtn"
                           runat="server" Text="Search" onclick="srchuserbtn_Click" />
                           <br /><br />

                       <asp:GridView ID="SrchUsrGrdView" runat="server" Width="600px" 
                           AutoGenerateColumns="False" AlternatingRowStyle-BorderStyle="None" 
                           GridLines="Horizontal" BackColor="White" BorderColor="#CCCCCC" 
                           BorderStyle="None" BorderWidth="1px" CellPadding="4" ForeColor="Black" 
                           >


                           <AlternatingRowStyle BorderStyle="None" />
                           <Columns>
                               <asp:TemplateField>
                               <ItemTemplate>
                                <asp:ImageButton ID="UsrSrchDeltBtn" runat="server" CommandName="Delete" ImageUrl="~/iconsimg/Delete2.png"
                                                OnClientClick="return confirm('Are you sure you want to Delete this Message?');"
                                                CommandArgument='<%# Eval("UID") %>' />
                                            &nbsp;&nbsp;
                               </ItemTemplate>
                               </asp:TemplateField>

                               <asp:TemplateField HeaderText="User ID">
                                   <ItemTemplate>
                                   <asp:Label ID="UsrSrchID" runat="server"  Text='<%# Eval("UID") %>'></asp:Label>
                                   </ItemTemplate>
                               </asp:TemplateField>

                               <asp:TemplateField HeaderText="First Name">
                               <ItemTemplate>
                                   <asp:Label ID="UsrSrchFN" runat="server"  Text='<%# Eval("FN") %>'></asp:Label>
                                   </ItemTemplate>
                               </asp:TemplateField>

                               <asp:TemplateField HeaderText="Last Name">
                               
                               <ItemTemplate>
                                   <asp:Label ID="UsrSrchLN" runat="server"  Text='<%# Eval("LN") %>'></asp:Label>
                                   </ItemTemplate>
                               </asp:TemplateField>

                               <asp:TemplateField HeaderText="Country">
                               <ItemTemplate>
                                   <asp:Label ID="UsrSrchContr" runat="server"  Text='<%# Eval("Country") %>'></asp:Label>
                                   </ItemTemplate>
                               </asp:TemplateField>

                           </Columns>
                           <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
                           <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
                           <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
                           <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
                           <SortedAscendingCellStyle BackColor="#F7F7F7" />
                           <SortedAscendingHeaderStyle BackColor="#4B4B4B" />
                           <SortedDescendingCellStyle BackColor="#E5E5E5" />
                           <SortedDescendingHeaderStyle BackColor="#242121" />


                       </asp:GridView>

                   </div>
                 
                    </ContentTemplate>
                    </asp:UpdatePanel>

 protected void srchuserbtn_Click(object sender, EventArgs e)
        {


            using (SqlConnection srchuserCON = new SqlConnection(sc))
            {
                string srchuser = "select * from UserInfo where UID=@search";
                SqlCommand srchuserCMD = new SqlCommand(srchuser, srchuserCON);
                srchuserCMD.Parameters.Add("@search", SqlDbType.NVarChar).Value = srchuserTxtBox.Text;

                srchuserCON.Open();
                srchuserCMD.ExecuteNonQuery();
                SqlDataAdapter srchuserDAAD = new SqlDataAdapter();
                srchuserDAAD.SelectCommand = srchuserCMD;
                DataSet srchuserDS = new DataSet();
                srchuserDAAD.Fill(srchuserDS, "UID");
                SrchUsrGrdView.DataSource = srchuserDS;
                SrchUsrGrdView.DataBind();
                srchuserCON.Close();
            }
        }