Hi,

I want to use databinding on a property for a class that I have created, but
I can't make it work. Below is a contrived example to illustrate the
problem.

It seems that I can't databind properties that I have created, is there a
way to do this?

Thanks,

Martin.

Public Class Form1

Public Class Class1
Inherits Button
Public MyValue As String = "Default Value"
End Class

Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
Dim t As New Class1

' This line would work as expected
' ----------------------------------
' TextBox1.DataBindings.Add("Text", t, "Size")

' This line causes runtime error:
' Cannot bind to property or column MyValue on DataSource.
' Parameter name: dataMember
' -------------------------------------------------------------
TextBox1.DataBindings.Add("Text", t, "MyValue")
End Sub

End Class

Martin,

You might try making MyValue a public property instead of a public field.

Kerry Moorman


"Martin Horn" wrote:

> Hi,
>
> I want to use databinding on a property for a class that I have created, but
> I can't make it work. Below is a contrived example to illustrate the
> problem.
>
> It seems that I can't databind properties that I have created, is there a
> way to do this?
>
> Thanks,
>
> Martin.
>
> Public Class Form1
>
> Public Class Class1
> Inherits Button
> Public MyValue As String = "Default Value"
> End Class
>
> Private Sub Form1_Load(ByVal sender As System.Object, _
> ByVal e As System.EventArgs) Handles MyBase.Load
> Dim t As New Class1
>
> ' This line would work as expected
> ' ----------------------------------
> ' TextBox1.DataBindings.Add("Text", t, "Size")
>
> ' This line causes runtime error:
> ' Cannot bind to property or column MyValue on DataSource.
> ' Parameter name: dataMember
> ' -------------------------------------------------------------
> TextBox1.DataBindings.Add("Text", t, "MyValue")
> End Sub
>
> End Class
>
>
>

Thanks Kerry, that did it.

To be honest I thought I had already tried that, must have got confused
somewhere along the line.

Martin.

"Kerry Moorman" <(E-Mail Removed)> wrote in message
news:3384CA17-EC5C-4402-BAFB-(E-Mail Removed)...
> Martin,
>
> You might try making MyValue a public property instead of a public field.
>
> Kerry Moorman
>
>
> "Martin Horn" wrote:
>
>> Hi,
>>
>> I want to use databinding on a property for a class that I have created,
>> but
>> I can't make it work. Below is a contrived example to illustrate the
>> problem.
>>
>> It seems that I can't databind properties that I have created, is there a
>> way to do this?
>>
>> Thanks,
>>
>> Martin.
>>
>> Public Class Form1
>>
>> Public Class Class1
>> Inherits Button
>> Public MyValue As String = "Default Value"
>> End Class
>>
>> Private Sub Form1_Load(ByVal sender As System.Object, _
>> ByVal e As System.EventArgs) Handles MyBase.Load
>> Dim t As New Class1
>>
>> ' This line would work as expected
>> ' ----------------------------------
>> ' TextBox1.DataBindings.Add("Text", t, "Size")
>>
>> ' This line causes runtime error:
>> ' Cannot bind to property or column MyValue on DataSource.
>> ' Parameter name: dataMember
>> ' -------------------------------------------------------------
>> TextBox1.DataBindings.Add("Text", t, "MyValue")
>> End Sub
>>
>> End Class
>>
>>
>>