Problems with web page with gridview with html button on each row - asp.net

Question

I inherited an asp.net web page that has a gridview control and an html button on each row in the gridview. I added "onserverclick" so that I could do some stuff at the server when this button is clicked. I can't use the asp button control because the manager wants it this way.
The end result is that I want to set the selected value of a dropdownlist control with a value from the gridview row. I got this working.
Now the problem. I am using an ajax ModalPopupExtender to display a panel as a popup window. But since I added the onservercontrol event, the popup now never displays. If I take off the onserverclick then the popup displays again but then I can't set my dropdownlist aelected value correctly.
I read something about having to do an ajax post. But not sure how to do that. I can post my html and C# code. Let me know what you need to see.

Answer 1

Trey,
Here is the html for my gridview control:
<asp:GridView CssClass="gridClass"
AlternatingRowStyle-CssClass="gridAlternateItem"
ID="gvMessage"
HeaderStyle-CssClass="gridHeader"
runat="server"
Width="98%"
ShowHeader="true"
AutoGenerateColumns="false"
AllowPaging="true"
AllowSorting="true"
PageSize="25"
PagerStyle-BackColor="#006699"
PagerStyle-ForeColor="White"
CellPadding="0"
CellSpacing="0"
OnPageIndexChanging="gvMessage_PageIndexChanging"
OnRowDataBound="gvMessage_RowDataBound"
OnSorting="gvMessage_Sorting"
OnSelectedIndexChanged="gvMessage_SelectedIndexChanged">
<Columns>
<asp:TemplateField ItemStyle-Height="20px" HeaderText="Task Date" SortExpression="DATE" HeaderStyle-ForeColor="white">
<ItemStyle Width="15%" HorizontalAlign="Left" CssClass=" gridRow" Wrap="false"/>
<ItemTemplate>
<asp:Label ID="lblDate" runat="server" Text='<%#Eval("Date")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Height="20px" HeaderText="Patient Name" SortExpression="Patient Chart" HeaderStyle-ForeColor="white">
<ItemStyle Width="15%" HorizontalAlign="Left" CssClass=" gridRow" Wrap="false"/>
<ItemTemplate>
<asp:Label ID="lblPatientChart" runat="server" Width="100%"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
Staff</HeaderTemplate>
<ItemStyle Width="15%" HorizontalAlign="Left" CssClass="gridRow" />
<ItemTemplate>
<asp:Label ID="lblStaff" runat="server" Width="100%"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Height="20px" HeaderText="Task Type" SortExpression="Message Type" HeaderStyle-ForeColor="white">
<ItemStyle Width="30%" HorizontalAlign="Left" CssClass=" gridRow" Wrap="false"/>
<ItemTemplate>
<asp:Label ID="lblTaskType" runat="server" Width="100%"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderStyle Width="10%" />
<ItemStyle Width="10%" CssClass="gridRow" />
<HeaderTemplate>
Task Notes</HeaderTemplate>
<ItemTemplate>
<input type="button" runat="server" id="btnTaskNotes" name="ADD" class="button" value="Note" style="width: 100px" onserverclick="OnServerClick"/>
<%--<input type="button" runat="server" id="btnTaskNotes" name="ADD" class="button" value="Note" style="width: 100px"/> --%>
<input type="hidden" runat="server" id="hidFkid" />
<input type="hidden" runat="server" id="hidPhysManagementId" />
<input type="hidden" runat="server" id="hidComments" />
<input type="hidden" runat="server" id="hidClinicalNote" />
<input type="hidden" id="hidPkPhoneId" runat="server" />
<input type="hidden" runat="server" id="hidFK_Practitioner_Id" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Height="20px" HeaderText="Delete" HeaderStyle-ForeColor="white">
<ItemStyle Width="10%" HorizontalAlign="Center" CssClass=" gridRow" Wrap="false"/>
<HeaderTemplate>
<input type=checkbox id="chkDeleteAll" runat=server onclick="CheckAll(this.id)"/>
<input type=button id="btnDelete" runat=server value="Delete" class="classButton" style="width: 60%;" onclick="DeleteMsg();"/></HeaderTemplate>
<ItemTemplate>
<input type=checkbox id="chkDelete" runat=server />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblFK_Practitioner_Id" runat="server" Visible="false" Text='<%#Eval("FK_Practitioner_Id")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
What else do you need to for me to post?