❔ ASP.NET Web Forms - Populating Labels using Primary key from Dropdown
Hi, using ASP.NET C# to build a webform. How do I populate a label with values from a SQL query (i'm getting a primary key from a dropdown list)
This is in WebForms
https://pastebin.com/aQPQDntn
This is what I have for the source. I cant find anything online about some specific line that is needed to get the data from a query for a primary key.
What I mean by this is I have a dropdown which contains my primary keys. And when I select one of those keys, it should populate the labels appropriately.
2 Replies
so, you need an on-change event handler for when the dropdown with the PK changes
you can have that trigger a re-post of the form, where your form code on the server will then have the PK and can use it to do whatever, when rendering the new page
or you can embed JavaScript in the form that will make ajax requests to an endpoint on your server that you need to add, which will retrieve the label values you want, then more JS code to plop them into the DOM
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