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How to Create Instance of Existing Object via Casting

Posted on 2014-03-02
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Last Modified: 2014-03-03
I am creating a DataGridView dynamically at run-time, and cant seem to be able to instantiate it as an object during casting in another (Form1) subroutine, so that I can change row labels.


Here is how I define the DataGridView in the Form1 Load procedure:


Dim DataGridView1 As New DataGridView

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Later, in a subroutine, when I want to change the row labels (numrows is the number of rows), I can't get the cast to work correctly because the cast won't allow me to use "As New" -- as follows:

Dim DataGridview1 As DataGridView = CType(Me.Controls("DataGridView1"), DataGridView)
For i = 1 To numrows
        DataGridview1.Columns.Add(i, "V" & i)
Next

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What is the correct way instantiate as an object a control that was spawned dynamically?
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Question by:lep1
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6 Comments
 
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Expert Comment

by:Melih SARICA
ID: 39900042
what error u got ?
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Author Comment

by:lep1
ID: 39900177
The error is that DataGridView1 is Nothing
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LVL 19

Accepted Solution

by:
Melih SARICA earned 500 total points
ID: 39900217
try

me.controls.find("datagridview1")
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Author Comment

by:lep1
ID: 39900343
It worked out that the the syntax

Dim DataGridView1 As New DataGridView

does not add the name "DataGridView1" to the control, so therefore it can't be found in Me.Controls().

I had to use:

DataGridView1.Name="DataGridView1" -->which corrected the problem of not finding the control.

Question: is there a difference between

Dim DataGridView1 As DataGridView

and

Dim DataGridView1 As New DataGridView

in terms of the Name property?
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LVL 19

Expert Comment

by:Melih SARICA
ID: 39900379
Dim DataGridview1 As DataGridView = CType(Me.Controls("DataGridView1"), DataGridView)

in this line, ur trying to find a control that is already on the page ? or trying to add a new one ?

I guess ur trying to find a newly created one..

so u ave to set a name, other wise ssytem ll gave a name automaticly.
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Author Comment

by:lep1
ID: 39900396
ok, thanks
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