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QuestionVS2017 Code behind function to disable check Box on Combo Box Text Value Pin
Jason Parker 3335-Jul-22 22:57
MemberJason Parker 3335-Jul-22 22:57 
Hello,
Quick intro, My name is Jason and recently a work colleague retired and had developed several ASPX websites of which I have been tasked to support.
My previous background of programming is around Delphi, Intersystems Cache and more recently C# but these websites that I'm now supporting are all written in VB.net, asp.net, aspx or whatever language it is called, as you have probably guessed by now I have never used Visual Studio or produced code that created aspx files.

Anyway as a newbie to this language I have run into a problem that you experts will have learnt in school Smile | :)

I have a webpage (student.aspx) that contains this snippet of code :

ASP.NET
<asp:DropDownList runat="server" ID="ddlCourse" DataTextField="Course"
                  DataValueField="Course" DataSourceID="SDSCourse" 
                  Width="260px" onChange="CheckNerveCenter"/>


I have added the "onChange" bit

and this bit of code is also existing

<asp:CheckBox ID="chkNerveCentre" runat="server" Text="Nerve Centre" TextAlign="Left" />


So basically the page contains several combo boxes and several check boxes

I need to do some logic for 2 of them, code above.

If the combo box contains text (from database) with the word Nursing, Nurse, Nurses etc. lets say "*Nurs* then teh tick box needs to be disabled so it cannot be ticked

This is the code I have done in the code behind file student.aspx.vb, it just contains a comment now

Function CheckNerveCenter() As Object
    'If ID="ddlCourse" contains any word like "*Nurs*" then
    'uncheck ID="chkNerveCentre" and then disable ID="chkNerveCentre"
End Function


At first I tried to get it to display a message to show that it was calling the function from the "onChange" but it doesn't seem to work.

As I'm new to this language would you please just help a newbie in the right direction

I did try and use the OnChangeText in visual studio but it just kept showing me this error

"Property Value not valid","Error HRESULT E_FAIL has been returned from a call to a COM component." I have no idea what this means

That's why I decided to try and use a function of my own but now stuck

Any ideas please?

Jason

modified 7-Jul-22 7:31am.

AnswerRe: VS2017 Code behind function to disable check Box on Combo Box Text Value Pin
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