Change ImageButton visible property in code dynamically

[Andy G]

I am tring to loop through a dataset to find records that exist. If the
record exists then make the corresponding image visible. So I try to take
the row value and concatenate it onto a string ("imgSession "), so the
resulting control ID name will be imgSessionX. Where X could be a number
corresponding to the ID of the image. I need help with the logic.

Dim row As DataRow

Dim myImage As Image

Dim imgName As String = "imgSession "

For Each row In ds.Tables(0).Ro ws

'something like the below code, I realize this doesn't work

imgName = "imgSession " & row(0)

myImage.ID = imgName

myImage.Visible = True

Next

Not suprisingly I am getting the error "Object reference not set to an
instance of an object."

Thanks!

[Andy G]

The subject line should read "Change Image visible property in code
dynamically" not ImageButton.

I could use a big Case statement but would rather not.

Select Case row(0)
Case 13
imgSession13.Vi sible = True
Case 14
imgSession14.Vi sible = True
End Select

Hopefully this helps out


"Andy G" <aj*****@iastat e.edu> wrote in message
news:eo******** ******@TK2MSFTN GP12.phx.gbl...

I am tring to loop through a dataset to find records that exist. If the
record exists then make the corresponding image visible. So I try to take
the row value and concatenate it onto a string ("imgSession "), so the
resulting control ID name will be imgSessionX. Where X could be a number
correspondin g to the ID of the image. I need help with the logic.

Dim row As DataRow

Dim myImage As Image

Dim imgName As String = "imgSession "

For Each row In ds.Tables(0).Ro ws

'something like the below code, I realize this doesn't work

imgName = "imgSession " & row(0)

myImage.ID = imgName

myImage.Visible = True

Next

Not suprisingly I am getting the error "Object reference not set to an
instance of an object."

Thanks!

[Marina]

Call the FindControl method with the name of the control you want.

"Andy G" <aj*****@iastat e.edu> wrote in message
news:eo******** ******@TK2MSFTN GP12.phx.gbl...

I am tring to loop through a dataset to find records that exist. If the
record exists then make the corresponding image visible. So I try to take
the row value and concatenate it onto a string ("imgSession "), so the
resulting control ID name will be imgSessionX. Where X could be a number
correspondin g to the ID of the image. I need help with the logic.

Dim row As DataRow

Dim myImage As Image

Dim imgName As String = "imgSession "

For Each row In ds.Tables(0).Ro ws

'something like the below code, I realize this doesn't work

imgName = "imgSession " & row(0)

myImage.ID = imgName

myImage.Visible = True

Next

Not suprisingly I am getting the error "Object reference not set to an
instance of an object."

Thanks!

[Andy G]

I don't think that will help. What I need to do is:

imgSession & [number that I got from the query].Visible = True so it would
look like the following if 13 was the number that was returned.
imgSession13.Vi sible = True

"Marina" <so*****@nospam .com> wrote in message
news:Or******** *****@TK2MSFTNG P12.phx.gbl...

Call the FindControl method with the name of the control you want.

"Andy G" <aj*****@iastat e.edu> wrote in message
news:eo******** ******@TK2MSFTN GP12.phx.gbl...

I am tring to loop through a dataset to find records that exist. If the
record exists then make the corresponding image visible. So I try to take
the row value and concatenate it onto a string ("imgSession "), so the
resulting control ID name will be imgSessionX. Where X could be a number
correspondi ng to the ID of the image. I need help with the logic.

Dim row As DataRow

Dim myImage As Image

Dim imgName As String = "imgSession "

For Each row In ds.Tables(0).Ro ws

'something like the below code, I realize this doesn't work

imgName = "imgSession " & row(0)

myImage.ID = imgName

myImage.Visible = True

Next

Not suprisingly I am getting the error "Object reference not set to an
instance of an object."

Thanks!

[C.F.]

The dataset will be displayed in a datagrid, correct?
In the ItemDataBound event handler check the viability of the database
record. If no, set the Image for that row to be invisible.

"Andy G" <aj*****@iastat e.edu> wrote in message
news:eo******** ******@TK2MSFTN GP12.phx.gbl...

I am tring to loop through a dataset to find records that exist. If the
record exists then make the corresponding image visible. So I try to take
the row value and concatenate it onto a string ("imgSession "), so the
resulting control ID name will be imgSessionX. Where X could be a number
correspondin g to the ID of the image. I need help with the logic.

Dim row As DataRow

Dim myImage As Image

Dim imgName As String = "imgSession "

For Each row In ds.Tables(0).Ro ws

'something like the below code, I realize this doesn't work

imgName = "imgSession " & row(0)

myImage.ID = imgName

myImage.Visible = True

Next

Not suprisingly I am getting the error "Object reference not set to an
instance of an object."

Thanks!