How can I populate a textbox from a dataview? I have a dataset i'm filtering
on and i want to populate several textboxes based on that filter.
How can i get that to work?
I've tried:
dsDetails = GetCars()
dvDetails = New DataView
With dvDetails
.Table = dsDetails.Tables(0)
.RowFilter = "CARMAKE=" & "'" & strModel& "'"
End With
txtName.DataBindings("NAME").ToString()
and i get this error(s)
Object reference not set to an instance of an object
or I get:
This would cause tow bindings in the collection to bind to the same property
Parameter name: binding
and i'm using this code
txtName.DataBindings.Add(New Binding("Text", dvDetails, "NAME"))
am I missing something or can this not be done? 14 3619
Barney - you need to ensure that you have a DataBinding for the textbox
before you reference it like that. If the bindings are already set - you
don't need to reset them each time. If you get rid of this line
txtName.DataBindings("NAME").ToString() Do you still get the exception?
--
W.G. Ryan, MVP www.tibasolutions.com | www.devbuzz.com | www.knowdotnet.com
"Barney" <Ba****@discussions.microsoft.com> wrote in message
news:49**********************************@microsof t.com... How can I populate a textbox from a dataview? I have a dataset i'm
filtering on and i want to populate several textboxes based on that filter.
How can i get that to work?
I've tried:
dsDetails = GetCars() dvDetails = New DataView With dvDetails .Table = dsDetails.Tables(0) .RowFilter = "CARMAKE=" & "'" & strModel& "'" End With txtName.DataBindings("NAME").ToString()
and i get this error(s) Object reference not set to an instance of an object
or I get:
This would cause tow bindings in the collection to bind to the same
property Parameter name: binding
and i'm using this code txtName.DataBindings.Add(New Binding("Text", dvDetails, "NAME"))
am I missing something or can this not be done?
Barney,
I am curious, why are you using your code like this dsDetails = GetCars() dvDetails = New DataView With dvDetails .Table = dsDetails.Tables(0) .RowFilter = "CARMAKE=" & "'" & strModel& "'" End With txtName.DataBindings("NAME").ToString()
You know that with this you type more characters and is used one extra
instruction (not that the last is in my idea important).
And while busy your code can be to show the "name" in the txtName confirm
the currencymanager
\\\
dsDetails = GetCars()
dvDetails as New DataView(dsDetails.Tables(0))
dvDetails.RowFilter = "CARMAKE=" & "'" & strModel& "'"
txtName.DataBindings.Add(New Binding("Text", dvDetails, "NAME"))
///
I hope this helps?
Cor
yes i still get the error
"W.G. Ryan eMVP" wrote: Barney - you need to ensure that you have a DataBinding for the textbox before you reference it like that. If the bindings are already set - you don't need to reset them each time. If you get rid of this line txtName.DataBindings("NAME").ToString() Do you still get the exception?
-- W.G. Ryan, MVP
www.tibasolutions.com | www.devbuzz.com | www.knowdotnet.com "Barney" <Ba****@discussions.microsoft.com> wrote in message news:49**********************************@microsof t.com... How can I populate a textbox from a dataview? I have a dataset i'm filtering on and i want to populate several textboxes based on that filter.
How can i get that to work?
I've tried:
dsDetails = GetCars() dvDetails = New DataView With dvDetails .Table = dsDetails.Tables(0) .RowFilter = "CARMAKE=" & "'" & strModel& "'" End With txtName.DataBindings("NAME").ToString()
and i get this error(s) Object reference not set to an instance of an object
or I get:
This would cause tow bindings in the collection to bind to the same property Parameter name: binding
and i'm using this code txtName.DataBindings.Add(New Binding("Text", dvDetails, "NAME"))
am I missing something or can this not be done?
I want to filter out the dataset (dataview) and only show the data in the
text box were it equals the users selection.
instead of creating another SQL and another hit to the DB i thought this
would be easier and a better performance.
instead of "select * from table where ID = " & selection "
"Cor Ligthert" wrote: Barney,
I am curious, why are you using your code like this
dsDetails = GetCars() dvDetails = New DataView With dvDetails .Table = dsDetails.Tables(0) .RowFilter = "CARMAKE=" & "'" & strModel& "'" End With txtName.DataBindings("NAME").ToString() You know that with this you type more characters and is used one extra instruction (not that the last is in my idea important).
And while busy your code can be to show the "name" in the txtName confirm the currencymanager \\\ dsDetails = GetCars() dvDetails as New DataView(dsDetails.Tables(0)) dvDetails.RowFilter = "CARMAKE=" & "'" & strModel& "'" txtName.DataBindings.Add(New Binding("Text", dvDetails, "NAME")) /// I hope this helps?
Cor
Barney,
I did mean why the "with" clause. For the rest I showed how you can do what
you want, some rows lower in my answer.
Cor
I follow, just a habit i developed.
even with the example you provided, i still can't pop a text box.
"Cor Ligthert" wrote: Barney,
I did mean why the "with" clause. For the rest I showed how you can do what you want, some rows lower in my answer.
Cor
Barney,
Strange as it looks are this "CARMAKE" and "NAME" you use in a windowform
case sensitive values (not in a webform). And I use nice spaces between the
selections however I don't know if that hurts.
Are you sure the cases are right?
Cor
I got it working, sort of. when i first load the form and select a cell in my
datagrid, the textbox is populate correctly, then when i select another cell
i get this error message:
This would cause two bindings in the collection to bind to the same
property. paramter name binding:
how can i get it to work when i select a new selection in my grid?
"Cor Ligthert" wrote: Barney,
Strange as it looks are this "CARMAKE" and "NAME" you use in a windowform case sensitive values (not in a webform). And I use nice spaces between the selections however I don't know if that hurts.
Are you sure the cases are right?
Cor
Barney,
What code are you using now?
And how do you set the dataview to the datagrid.
Cor
here is what i have:
dsDetails = GetCars()
Dim dvDetails As New DataView(dsDetails.Tables(0))
dvDetails.RowFilter = "CARMAKE=" & "'" & strModel & "'"
txtName.DataBindings.Add("Text", dvDetails, "NAME")
Catch ex As Exception
MessageBox.Show("The following error has occurred: " &
ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
"Cor Ligthert" wrote: Barney,
What code are you using now? And how do you set the dataview to the datagrid.
Cor
Barney,
You did not show the datagrid as I asked, however when it is like this dsDetails = GetCars() Dim dvDetails As New DataView(dsDetails.Tables(0))
datagrid1.datasource = dvDetails txtName.DataBindings.Add("Text", dvDetails, "NAME")
Than will in the textbox the current selected row be displayed from the
datagrid.
(What is done by the bindingcontext and the currencymanager)
Is that where you are after?
Cor
what i have is a function that talks to my db and gets me all the data to
populate the datagrid. That function returns a dataset, so in my form_Load i
have code such as
datagrid1.datasource = GetCars.Table(0) which populates the grid just like i
want. Then i have code in the datagrid1_selectionChanged to populate the
textboxes based on the users selection (the cell they clicked on). The user
can select 1 at a time so when the pick on then them details show up, if they
select another one then detais for that selection need to be displayed and so
on. I can get the first selection to work correctly, its when I choose
another one is when i get the error
I'm able to do this on a asp.net web form, so why will this not work on a
winForm?
"Cor Ligthert" wrote: Barney,
You did not show the datagrid as I asked, however when it is like this dsDetails = GetCars() Dim dvDetails As New DataView(dsDetails.Tables(0))
datagrid1.datasource = dvDetails txtName.DataBindings.Add("Text", dvDetails, "NAME")
Than will in the textbox the current selected row be displayed from the datagrid. (What is done by the bindingcontext and the currencymanager)
Is that where you are after?
Cor
Why don't you than try to change it as I told.
You can do it as well like this.
dsDetails = GetCars()
txtName.DataBindings.Add("Text", dsDetail.Tables(0), "NAME")
datagrid1.datasource = dsDetail.Tables(0)
Dont't compare the webform datagrid with the winform datagrid, that is done
by a lot of winform programmers for a webform datagrid. It are both grids
which has a datasource and with that is in my opinin all said.
Cor
I'll give this a shot, but the textboxes are only populated based on the
selection made by the user in the datagrid. The text box is not in the
datagrid, it is on the form below the grid. I'm not sure if your thinking the
textbox is in the grid or not. its not in the grid
"Cor Ligthert" wrote: Why don't you than try to change it as I told.
You can do it as well like this.
dsDetails = GetCars() txtName.DataBindings.Add("Text", dsDetail.Tables(0), "NAME") datagrid1.datasource = dsDetail.Tables(0)
Dont't compare the webform datagrid with the winform datagrid, that is done by a lot of winform programmers for a webform datagrid. It are both grids which has a datasource and with that is in my opinin all said.
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