Geoprocessor: using arc toolbox in vb.net

Question

i am doing the following in order to use the predefined tool points to line in arctool box

        Dim ptoline As ESRI.ArcGIS.DataManagementTools.PointsToLine = New ESRI.ArcGIS.DataManagementTools.PointsToLine
        Dim pgeo As ESRI.ArcGIS.Geoprocessor.Geoprocessor = New ESRI.ArcGIS.Geoprocessor.Geoprocessor
        ptoline.Input_Features = " D:\Mayur\shapefiles\new_pooint_3.shp"
        ptoline.Output_Feature_Class = " D:\Mayur\shapefiles\new_line123.shp"

        pgeo.OverwriteOutput = True

        Dim geoProcessorResult As IGeoProcessorResult
        geoProcessorResult = pgeo.Execute(ptoline, Nothing)

i dont know the exact syntax of it. after running it shows error on

geoProcessorResult = pgeo.Execute(ptoline, Nothing)

Error HRESULT E_FAIL has been returned from a call to a COM component.

the references geoprocessor and datamanagement tools are included.

the path to the input feature is correct. the o/p file is created automatically.

Is there any prerequisite to run geoprocessor?

Do I have to do that workspace thing also ?

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now i know that this "points to line " is something different from other tools. it is a (third party tool) CUSTOM TOOL i guess and their interfacing is different,

i tried out with other tools and they all worked perfectly.

Can you tell me whether my conclusion that it is a custom tool is correct or not?

How do I interface these custom tools?

Answer 1

I did it like this:

Dim pgeo As ESRI.ArcGIS.Geoprocessor.Geoprocessor = New ESRI.ArcGIS.Geoprocessor.Geoprocessor

pgeo.AddToolbox("c:\program files (x86)\arcgis\desktop10.1\ArcToolbox\Toolboxes\Data Management Tools.tbx")

Dim parameters As IVariantArray = New VarArray 

parameters.Add("D:\Mayur\shapefiles\new_pooint_3.shp")

parameters.Add("D:\Mayur\shapefiles\new_line123.shp")

pgeo.Execute("PointsToLine", parameters, Nothing)