Assigning text box values dynamically in a loop in VB.net

Question

I have 20+ text boxes that are all named like: TxtCustom1 TxtCustom2 TxtCustom3 and so on...

I want to be able to assign those text boxes values in a loop by building the text box var name dynamically with a int concatenated so that my loop would be something like this pseudo code:

For Each pair In Dictionary
TxtCustom{pair.key}.Text = pair.Value 
Next

Is building names dynamically like this possible in vb.net, how would something like this be accomplished?

JohnFx · Accepted Answer · 2011-02-10 21:29:22Z

2

Seems like it would be better to use some kind of control like a grid for this than a series of textboxes with names following a template, but here is how you do it based on the scenario you discussed.

For Each pair In Dictionary
   Me.Controls(String.format("TxtCustom{0}",pair.key)).Text= pair.Value 
Next

edited Feb 10, 2011 at 21:29

answered Feb 10, 2011 at 21:22

JohnFx

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3 Comments

Brian M. Over a year ago

Furthermore, for anything other than properties that exist on Control (such as .Text), you'd need to cast the return of Me.Controls() into that type: CType(Me.Controls("txtCustom" & pair.key), TextBox).PasswordChar = "*" , for example

user612109 Over a year ago

Thanks for the help. Me.Controls(String.Format("TxtCustom{0}", pair.Key)).Text = pair.Value is giving me a "Object reference not set to an instance of an object" NullReferenceException, I know the key and values exist.

JohnFx Over a year ago

try replacing the string.format(...) part with a hardcoded string with the exact textbox control name to confirm that the object exists. I tested this code as is with a sample form and it worked fine for me. The only thing I can think is that the pair.key value isn't correct. or the control name doesn't start with "TxtCustom"

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