ASP.NET

<div id="parentContainer" onclick="__doPostBack('ParentUpdatePanel', '');" />
      <asp:updatepanel id="ParentUpdatePanel" runat="server" updatemode="Conditional" xmlns:asp="#unknown">
          <contenttemplate>
                  <asp:label id="lblparenttime" runat="server"></asp:label>
                  <asp:linkbutton id="lnkbutn" runat="server" text=" lcick me to open popup" onclientclick="return showpopup();" />

          </contenttemplate>
      </asp:updatepanel>

          <div id="Div1" onclick="__doPostBack('ParentUpdatePanel', '');" />
      <asp:updatepanel id="UpdatePanel1" runat="server" updatemode="Conditional" xmlns:asp="#unknown">
          <contenttemplate>
                  <asp:label id="Label2" runat="server"></asp:label>
                  <asp:linkbutton id="LinkButton1" runat="server" text=" lcick me to open popup" onclientclick="return showpopup();" />

          </contenttemplate>
      </asp:updatepanel>

Rama Charan Prasad

"Be happy and Keep smiling.Thats what u want be always.. "

<asp:regularexpressionvalidator id="RegularExpressionValidator1" runat="server" controltovalidate="txtEmail" validationexpression="^\w+[\w-\.]*\@\w+((-\w+)|(\w*))\.[a-z]{2,3}$" errormessage="Please enter an email address in the form xyz@abc.com" xmlns:asp="#unknown"></asp:regularexpressionvalidator>

//Insert to database and display task reference
            try
            {
                conAppDB.Open();
                // Retrieve latest taskID from database and display it.
                //:TODO  Update design, because of possible concurrent users.
                string getTaskRef = @"SELECT MAX([taskID_PK]) FROM [teamwiki].[dbo].[task];";  
                SqlCommand getTaskRefSQL = new SqlCommand(getTaskRef, conAppDB);
                if (getTaskRefSQL != null)
                {
                    txtTaskRef.Text = (string)getTaskRefSQL.ExecuteScalar(); 

// Note: Although the code passes through here, the value of getTaskRefSQL is null, is this a bug?

                }

            }
            catch (InvalidCastException)
            { 
                //Occurs when database is empty.
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally {
                conAppDB.Close();
            }