How to Add Multiple Rows in DataGrid In UpdatePanel

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ASP.NET

I want to add product and quantity in data grid from drop down list and text box. But the problem i am facing is that when i am pressing link button only 1 row is being added and when i add another product it overwrites the previous one.

This is the Code of .aspx

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
     <ContentTemplate>
     
      <table align=center cellpadding="200px">
          
              <caption>
                  <label>
                  Select Regular Sheesha</label>
                  <tr>
                      <td>
                          <asp:DropDownList ID="Drop_nsheesha" runat="server" 
                              >
                          </asp:DropDownList>
                      </td>
                      <td>
                                
                          <asp:Label ID="Label3" runat="server" Text="Quantity"></asp:Label>
                              
                      </td>
                      <td>
                          <asp:TextBox ID="TextBox_SimpleSheesha" runat="server" width="30px" />
                      </td>
                      <caption>
                          <br />
                          <tr>
                              <td>
   <asp:LinkButton ID="LinkButton1" runat="server"       onclick="LinkButton1_Click">ADD</asp:LinkButton>
                              </td>
                          </tr>
                      </caption>
                  </tr>
              </caption>
         
          
     </table>
    
        <asp:GridView ID="GridView2" runat="server" >
        </asp:GridView>
      
        </ContentTemplate>
         </asp:UpdatePanel>

This is CS Code

DataTable temp = new DataTable();
        protected void Page_Load(object sender, EventArgs e)
        {

            temp.Columns.Add("Sheesha");
            temp.Columns.Add("Quantity");
         }

 protected void LinkButton1_Click(object sender, EventArgs e)
        {
            temp.Rows.Add();
            temp.Rows[temp.Rows.Count - 1]["Sheesha"] = Drop_nsheesha.SelectedItem;
            temp.Rows[temp.Rows.Count - 1]["Quantity"] = TextBox_SimpleSheesha.Text;
            GridView2.DataSource = temp;
            GridView2.DataBind();

        }
("Quantity");
}