Syntax error using INNER JOIN and SqlDataSource with MySQL - asp.net

Question

I am trying to write an update command that joins 2 tables using an SqlDataSource. I have it working with 1 table, but when I put my INNER JOIN syntax in I get thrown an error. It says "My syntax is wrong. Check MySql manual for correct syntax"
Here is my Code from my ASPX page.:
<asp:SqlDataSource ID="AdminSalesmanDetailDS" runat="server"
ConnectionString="<%$ ConnectionStrings:intelliairConnectionString %>"
ProviderName="<%$ ConnectionStrings:intelliairConnectionString.ProviderName %>"
SelectCommand="individual_AddressByIndividualID"
SelectCommandType="StoredProcedure"
UpdateCommand="UPDATE individual SET
FarmName = #FarmName,
FirstName = #FirstName,
MiddleName = #MiddleName,
Address1 = #Address1,
City = #City
INNER JOIN address a ON i.IndividualID = a.IndividualID,
WHERE IndividualID=#IndividualID">
<SelectParameters>
<asp:ControlParameter ControlID="gvSalesman" Name="oIndividualID"
PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter Name="FarmName" ControlId="fvAdminSalesmanDetail$CompanyTextBox" PropertyName="Text"/>
<asp:ControlParameter Name="FirstName" ControlId="fvAdminSalesmanDetail$FirstNameTextBox" PropertyName="Text"/>
<asp:ControlParameter Name="MiddleName" ControlId="fvAdminSalesmanDetail$MiddleNameTextBox" PropertyName="Text"/>
<asp:ControlParameter Name="Address1" ControlId="fvAdminSalesmanDetail$Address1TextBox" PropertyName="Text"/>
<asp:ControlParameter Name="City" ControlId="fvAdminSalesmanDetail$cityTextBox" PropertyName="Text"/>
</UpdateParameters>
</asp:SqlDataSource>
UPDATE
I have it working with 2 tables now. However it updates every Individual in the Table. For example: I am trying to update 1 person and I change the first name to Mark. When I click update , it changes everyone in the Database First Name to Mark.
Here is my new Code from my ASPX page.:
<asp:SqlDataSource ID="AdminSalesmanDetailDS" runat="server"
ConnectionString="<%$ ConnectionStrings:intelliairConnectionString %>"
ProviderName="<%$ ConnectionStrings:intelliairConnectionString.ProviderName %>"
SelectCommand="individual_AddressByIndividualID"
SelectCommandType="StoredProcedure"
UpdateCommand="UPDATE individual i
inner join address a
on a.individualID = i.individualID
set
i.FarmName = #FarmName,
i.FirstName = #FirstName,
i.LastName = #LastName,
i.MiddleName = #MiddleName,
i.Phone = #Phone,
i.PhoneExtention = #PhoneExtention,
i.MobilPhone = #MobilPhone,
i.Fax = #Fax,
i.Email = #Email,
a.Address1 = #Address1,
a.Address2 = #Address2,
a.City = #City,
a.State = #State,
a.Zip = #Zip,
a.Country = #Country
where
i.IndividualID = i.IndividualID">
<SelectParameters>
<asp:ControlParameter ControlID="gvSalesman" Name="oIndividualID"
PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter Name="FarmName" ControlId="fvAdminSalesmanDetail$CompanyTextBox" PropertyName="Text"/>
<asp:ControlParameter Name="FirstName" ControlId="fvAdminSalesmanDetail$FirstNameTextBox" PropertyName="Text"/>
<asp:ControlParameter Name="MiddleName" ControlId="fvAdminSalesmanDetail$MiddleNameTextBox" PropertyName="Text"/>
<asp:ControlParameter Name="Address1" ControlId="fvAdminSalesmanDetail$Address1TextBox" PropertyName="Text"/>
<asp:ControlParameter Name="City" ControlId="fvAdminSalesmanDetail$cityTextBox" PropertyName="Text"/>
</UpdateParameters>
</asp:SqlDataSource>

Answer 1

You have your JOIN after the SET, and you're not being specific about which table each field is referencing. I think, to use JOIN in an UPDATE, you need syntax more like this:
UpdateCommand=" UPDATE
individual i
INNER JOIN
address a
ON i.IndividualID = a.IndividualID
SET
i.FarmName = #FarmName,
i.FirstName = #FirstName,
i.MiddleName = #MiddleName,
a.Address1 = #Address1,
a.City = #City
WHERE
i.IndividualID=#IndividualID" >
Edit: Based on the update to your question, it looks like you have (in your WHERE clause)
i.IndividualID=i.IndividualID
This is what's causing all your records to be updated (because that statement is always true). As in my above example, you need to have
i.IndividualID=#IndividualID
This way only the row(s) whose ID matches your parameter gets updated (presumably just one).