[RESOLVED] Referring to MSChart with Variable - CType

[min1me]

Hello,

Is it possible to use CType to refer to an MSChart control using a variable? I've seen many examples of this being used for textbox, combobox etc but I can't seem to get it to work for MSChart

Dim chartID = "Chart" & x
CType(Controls(chartID), System.Web.UI.DataVisualization.Charting.Chart).Visible = True
CType(Controls(chartID), System.Web.UI.DataVisualization.Charting.Chart).Width = 800

Is it "System.Web.UI.DataVisualization.Charting.Chart" that I'm getting wrong? Is there a better way of doing it?

Thanks!

[KGComputers]

Hi,

Yes, you can use CType for to cast controls to its specific type. Actually, there are other methods
for type casting.

Quick question though, are you referring to ASP.NET charting control or winforms chart control?
If its the latter, change System.Web.UI.DataVisualization.Charting.Chart to
System.Windows.Forms.DataVisualization.Charting.Chart.

   CType(Controls("chart1"), System.Windows.Forms.DataVisualization.Charting.Chart).Visible = True
   CType(Controls("chart1"), System.Windows.Forms.DataVisualization.Charting.Chart).Dock = DockStyle.Fill
   CType(Controls("chart1"), System.Windows.Forms.DataVisualization.Charting.Chart).BackColor = Color.AliceBlue

KG

[min1me]

It's the ASP.NET charting control - I get this error when trying to use a variable in lieu of the actual chart ID:

System.InvalidCastException: Conversion from string "Chart1" to type 'Integer' is not valid. ---> System.FormatException: Input string was not in a correct format. at Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) --- End of inner exception stack trace

If I simplify to CType(Controls("Label1"), Label).Text = "Hello!!" and run in debug - I get similar error:

Conversion from string "Label1" to type 'Integer' is not valid

[KGComputers]

Just a slight modification. For accessing asp.net control, use FindControl() method.
You might use CType() as alternative to DirectCast().

See sample below:

Dim id As String = DirectCast(Page.FindControl("Chart1"), System.Web.UI.DataVisualization.Charting.Chart).ID

KG

[min1me]

Excellent - thank you for your help - been stuck on that all morning!

[KGComputers]

Great that helped you! Kindly mark this thread as RESOLVED.

KG