Not able to test BackColor of control

[tshad]

I have a Windows form where I am trying to set the BackColor of a control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

I can apparently do:

control.BackCol or = System.Drawing. Color.Blue

Why can't I test the color?

Thanks,

Tom

[Tom Shelton]

On Nov 3, 7:58 pm, "tshad" <t...@dslextrem e.comwrote:

I have a Windows form where I am trying to set the BackColor of a control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

I can apparently do:

control.BackCol or = System.Drawing. Color.Blue

Why can't I test the color?

Thanks,

Tom

Try using:

If control.BackCol or.Equals(Syste m.Drawing.Color .Blue) Then
....
else
....
end if

--
Tom Shelton

[tshad]

"Tom Shelton" <to*********@co mcast.netwrote in message
news:11******** *************@d 55g2000hsg.goog legroups.com...

On Nov 3, 7:58 pm, "tshad" <t...@dslextrem e.comwrote:

>I have a Windows form where I am trying to set the BackColor of a control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawin g.Color'.

I can apparently do:

control.BackCo lor = System.Drawing. Color.Blue

Why can't I test the color?

Thanks,

Tom

Try using:

If control.BackCol or.Equals(Syste m.Drawing.Color .Blue) Then

That worked.

Where else do I need to use .Equals?

I would assume that if I set a value using an assignment (=), that I would
also be able to test it the same way?

If :

control.BackCol or = System.Drawing. Color.Blue

why not

IF control.BackCol or = System.Drawing. Color.Blue then ...

Thanks,

Tom

...
else
...
end if

--
Tom Shelton

[Herfried K. Wagner [MVP]]

"tshad" <tf*@dslextreme .comschrieb:

>I have a Windows form where I am trying to set the BackColor of a control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

In addition to the other replies: I assume you are using VB.NET 2002/2003.
Those versions do not yet support operator overloading. With VB 2005, the
code above would compile because VB 2005 supports operator overloading and
'Color' overloads the '=' (comparison) operator.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

[Tom Shelton]

On Nov 5, 12:29 pm, "Herfried K. Wagner [MVP]" <hirf-spam-me-
[e-mail] e:

"tshad" <t...@dslextrem e.comschrieb:

I have a Windows form where I am trying to set the BackColor of a control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

In addition to the other replies: I assume you are using VB.NET 2002/2003.
Those versions do not yet support operator overloading. With VB 2005, the
code above would compile because VB 2005 supports operator overloading and
'Color' overloads the '=' (comparison) operator.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

I was going to ask him if he was using VB.NET 2002/2003 - but then I
realized, he had to be or he wouldn't have gotten the error :)

--
Tom Shelton

[tshad]

"Tom Shelton" <to*********@co mcast.netwrote in message
news:11******** **************@ v23g2000prn.goo glegroups.com.. .

On Nov 5, 12:29 pm, "Herfried K. Wagner [MVP]" <hirf-spam-me-
[e-mail] e:

>"tshad" <t...@dslextrem e.comschrieb:

>I have a Windows form where I am trying to set the BackColor of a
control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

In addition to the other replies: I assume you are using VB.NET
2002/2003.
Those versions do not yet support operator overloading. With VB 2005,
the
code above would compile because VB 2005 supports operator overloading
and
'Color' overloads the '=' (comparison) operator.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

I was going to ask him if he was using VB.NET 2002/2003 - but then I
realized, he had to be or he wouldn't have gotten the error :)

You're right.

It is VS.Net 2003.

Tom

>
--
Tom Shelton

[Tom Shelton]

On Nov 5, 4:01 pm, "tshad" <t...@dslextrem e.comwrote:

"Tom Shelton" <tom_shel...@co mcast.netwrote in message

news:11******** **************@ v23g2000prn.goo glegroups.com.. .

On Nov 5, 12:29 pm, "Herfried K. Wagner [MVP]" <hirf-spam-me-
[e-mail] e:

"tshad" <t...@dslextrem e.comschrieb:

I have a Windows form where I am trying to set the BackColor of a
control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

In addition to the other replies: I assume you are using VB.NET
2002/2003.
Those versions do not yet support operator overloading. With VB 2005,
the
code above would compile because VB 2005 supports operator overloading
and
'Color' overloads the '=' (comparison) operator.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

I was going to ask him if he was using VB.NET 2002/2003 - but then I
realized, he had to be or he wouldn't have gotten the error :)

You're right.

It is VS.Net 2003.

Tom

I figured it must be... Those versions don't support operator
overloading. Another way you could have done this is called
op_equality directly, but that is a little more ugly then just
calling .Equals.

Just so you know, in VB.NET 2005 and latter, you could just say:

If control.BackCol or = Color.Red then

--
Tom Shelton

[tshad]

"Tom Shelton" <to*********@co mcast.netwrote in message
news:11******** *************@5 7g2000hsv.googl egroups.com...

On Nov 5, 4:01 pm, "tshad" <t...@dslextrem e.comwrote:

>"Tom Shelton" <tom_shel...@co mcast.netwrote in message

news:11******* *************** @v23g2000prn.go oglegroups.com. ..

On Nov 5, 12:29 pm, "Herfried K. Wagner [MVP]" <hirf-spam-me-
[e-mail] e:
"tshad" <t...@dslextrem e.comschrieb:

>I have a Windows form where I am trying to set the BackColor of a
control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

>In addition to the other replies: I assume you are using VB.NET
2002/2003.
Those versions do not yet support operator overloading. With VB 2005,
the
code above would compile because VB 2005 supports operator overloading
and
'Color' overloads the '=' (comparison) operator.

>--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

I was going to ask him if he was using VB.NET 2002/2003 - but then I
realized, he had to be or he wouldn't have gotten the error :)

You're right.

It is VS.Net 2003.

Tom

I figured it must be... Those versions don't support operator
overloading. Another way you could have done this is called
op_equality directly, but that is a little more ugly then just
calling .Equals.

Just so you know, in VB.NET 2005 and latter, you could just say:

If control.BackCol or = Color.Red then

That's great.

I am hoping some of the other objects on forms are easier to deal with as
they are in asp.net, such as DataGrid. I'm sure you've noticed I have asked
a lot of questions about DataGrids for forms. Handling it is not as
intuitive as for the DataGrid on Asp.Net. Most of the objects are have the
same of similar methods and attributes such as getting number of rows or
getting data from the object. On windows forms, it doesn't seem to be a
straight forward.

Thanks,

Tom

>
--
Tom Shelton

[Tom Shelton]

On Nov 6, 2:49 pm, "tshad" <t...@dslextrem e.comwrote:

"Tom Shelton" <tom_shel...@co mcast.netwrote in message

news:11******** *************@5 7g2000hsv.googl egroups.com...

On Nov 5, 4:01 pm, "tshad" <t...@dslextrem e.comwrote:

"Tom Shelton" <tom_shel...@co mcast.netwrote in message

>news:11******* *************** @v23g2000prn.go oglegroups.com. ..

On Nov 5, 12:29 pm, "Herfried K. Wagner [MVP]" <hirf-spam-me-
[e-mail] e:
"tshad" <t...@dslextrem e.comschrieb:

I have a Windows form where I am trying to set the BackColor of a
control
and check the color before I do it:

If control.BackCol or = System.Drawing. Color.Blue Then
ChangeColor(con trol, Color.Red)
Else
ChangeColor(con trol, Color.Blue)
End If

But I get an error:

Operator '=' is not defined for types 'System.Drawing .Color' and
'System.Drawing .Color'.

In addition to the other replies: I assume you are using VB.NET
2002/2003.
Those versions do not yet support operator overloading. With VB 2005,
the
code above would compile because VB 2005 supports operator overloading
and
'Color' overloads the '=' (comparison) operator.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

I was going to ask him if he was using VB.NET 2002/2003 - but then I
realized, he had to be or he wouldn't have gotten the error :)

You're right.

It is VS.Net 2003.

Tom

I figured it must be... Those versions don't support operator
overloading. Another way you could have done this is called
op_equality directly, but that is a little more ugly then just
calling .Equals.

Just so you know, in VB.NET 2005 and latter, you could just say:

If control.BackCol or = Color.Red then

That's great.

I am hoping some of the other objects on forms are easier to deal with as
they are in asp.net, such as DataGrid.

I don't know - asp.net and windows forms are completely different on
most things, when it comes to controls :) Comming form an asp.net
background you might find WPF a little more to your liking.

I'm sure you've noticed I have asked
a lot of questions about DataGrids for forms. Handling it is not as
intuitive as for the DataGrid on Asp.Net. Most of the objects are have the
same of similar methods and attributes such as getting number of rows or
getting data from the object. On windows forms, it doesn't seem to be a
straight forward.

Thanks,

Tom

As for the DataGrid - wish I could help you there. I'm not much of a
datagrid person. I do know that in 2005, they have deprecated the
datagrid completely (well, almost completely, the only place you would
use it is if you need to display your data in a hiearchial format).
The replacement is the DataGridView. You usually hook it to a
BindingSource, etc, etc....

To be honest, most of my grid experience has been with the Janus
Grid :)

--
Tom Shelton

[Cor Ligthert[MVP]]

Tom,

I would not see direct the DataGridView as a replacement for a windows form
DataGrid.

A datagrid can show datasets, a DataGridView only single tables of that
however too all kind of other classes. It is a complete different complex
data control).

Although I agree that in the DataGridView the problems in from the DataGrid
are not repeated in the DataGridView.

Ken has specialized himself a little bit in it, we have together a website.

http://www.vb-tips.com/default.aspx

The website needs revision, we have probably used to much Ajax in it, it is
fast but not easy to handle.

Cor