Question

I am writing a SharePoint web part that interacts with a SQL database, allowing users to set a few parameters with some dropdownlists and pull the record for a given customer.

I would like for one of three particular HTML tables to be displayed once the customer is selected. What I am confused about is how I can render HTML after the page has already ran RenderContents. Initially, I just need the ddls and a button to be displayed so that the user can make their selections, so I have put those in the RenderContents method. Once they click the button, I d like to display one of three tables containing the data, which would be determined by the parameters they have set. I m not sure how to begin writing such a method, although I m sure it would involve HtmlTextWriter. This is pseudocode to represent what I need:

protected override void RenderContents(System.Web.UI.HtmlTextWriter output)
{
    ... displays dropdownlists and button ...
   renderMachineSpecifications();
}

void renderMachineSpecifications()
{
   if (record returned according to ddls is in the range 1000-1999)
   {
        // Render table type A and fill with information from database
   }
   else if (record returned according to ddls is in the range 2000-2999)
   {
        // Render table type B and fill with information from database
   }
   else
   {
        // Output error message
   }
}

Thanks very much!

Answer 1

I m afraid this is a problem that s screaming for AJAX. Here is the link to ASP.NET AJAX inside SharePoint (MSDN). If you google around you may also find some other nuggets like this one on CodePlex.

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