How to pass a combo box parameter on reporting services?

How to pass a combo box parameter on reporting services?
For example, a report has a parameter which is a combo box, its items came from a database query.
Looks like the combo box didn't got populated and greyed out if I didn't pass the parameter.

Hi LAScorpion,
In Reporting Services, if we want to pass a combo box parameter (means signal-parameter) from one report (main report) to another report (subreport), we can enable an action with “Go to report” or “Go to URL” option to achieve the requirement. For more details,
please see:
Method1: Go to report
Right-click a report item to open the properties dialog in subreport, click Action in the left pane.
Enable Go to report action, then select the main report name in the drop-down list.
Add a parameter as below:
Select ID (a parameter name from main report) in the drop-down list of Name, and select [ID] (a field name from subreport) in the drop-down list of Value.
Method2: Go to URL
Right-click a report item to open the properties dialog in subreport, click Action in the left pane.
Enable Go to URL action, the URL below is for your reference:
="javascript:void(window.open('http://server_name/ReportServer/Pages/ReportViewer.aspx?%2ffolder_name%2fmain_report_name&rs:Command=Render&parameter_name="& Parameters!parameter_name.Value &"'))"
Besides, if the parameter’s values are based on other parameters, then the combo-box got greyed out when we haven’t select values in preceding parameters. For more details, please see:
Cascading Parameters
If there are any misunderstanding, please elaborate the issue for further investigation.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

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Hello Barry,
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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mc:Ignorable="d"
d:DesignWidth="300"
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Imports Microsoft.VisualBasic
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Namespace CCIS.ViewModel.Case
''' <summary>
''' ViewModel of an individual Email
''' </summary>
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Inherits vmParty
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''' </summary>
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Public Overrides ReadOnly Property Model() As tblParty
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Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports CCIS.Model.Case
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what I need to Know is how to route the binding path if it exists in a different ViewModel?
Sir, I look forward to your early reply bringing a workable solution to the problem I face.
Warm Regards,
Arun

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2.I can call the labview dll in labview via CLF Node, when the VISAResourceName parameter is set to Numeric(32-bit int or 32-bit usigned int) OR Adapt to data(Handle by Value). And I got the value of the VISAResourceName parameter, which is 0; When I directly connect 0 to the dll, it still works. But in labwindows, when I pass 0 to the VISAResourceName parameter of the dll function, I got a FATAL RUN-TIME ERROR: The program has caused a 'General Protection' fault.
mkossmann 已写：
Could you check what exactly uintptr_t *VISAResourceName in your labview dll does.Might it be that it is connected to the labviews Dll internal ViOpen() ViSession output parameter ?. And the name VISAResourceName is misleading.
Another idea would be that Labview uses 32bit Unicode for the ResourceName. And you have to convert the C String to that Unicode first.

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