I'm using this coding to get 2 resultsets thru datareader and then load them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
10  2077 
Peter,
Can you explain me why you use this method, as far as I can see it now, it
is going from NY to Wasinton to Jersey City over LA.
Normally we use direct the DataAdapter Fill, however there should be a
reason?
It cannot be that it is quicker, because that is AFAIK culprit, you have to
write at least more code while the result is the same, although you need
probably after what you do now at least an acceptchanges of course, which is
automaticly done by the fill.
However, there must be a reason and I am currious about that?
Cor
"Peter" <Pe***@discussi ons.microsoft.c omschreef in bericht
news:DF******** *************** ***********@mic rosoft.com...
I'm using this coding to get 2 resultsets thru datareader and then load
them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that
possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hi Cor,
I'm just trying different ways to retrieve data: datareader, dataadapter,
tableadapter, DAAB , and LINQ.
One of the objectives is to retrieve master-details resultsets and populate
them into datagridviews for read-only purpose. This probably will be
implemented as a class for generic usage.
Peter
"Cor Ligthert[MVP]" wrote:
Peter,
Can you explain me why you use this method, as far as I can see it now, it
is going from NY to Wasinton to Jersey City over LA.
Normally we use direct the DataAdapter Fill, however there should be a
reason?
It cannot be that it is quicker, because that is AFAIK culprit, you have to
write at least more code while the result is the same, although you need
probably after what you do now at least an acceptchanges of course, which is
automaticly done by the fill.
However, there must be a reason and I am currious about that?
Cor
"Peter" <Pe***@discussi ons.microsoft.c omschreef in bericht
news:DF******** *************** ***********@mic rosoft.com...
I'm using this coding to get 2 resultsets thru datareader and then load
them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that
possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hello Peter ,
did you set the MARS parameter to true in the connection string ?
Dim objConn As New SqlConnection(" MultipleActiveR esultSets=True; Persist
Security Info=False;User ID=sa;Password= pwd;Initial Catalog=tempdat abase")
"Peter" <Pe***@discussi ons.microsoft.c omschreef in bericht
news:DF******** *************** ***********@mic rosoft.com...
I'm using this coding to get 2 resultsets thru datareader and then load
them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that
possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hi Michel,
I guess this may be the problem. Will need to try it tomorrow.
Thanks,
Peter
"Michel Posseth [MCP]" wrote:
Hello Peter ,
did you set the MARS parameter to true in the connection string ?
Dim objConn As New SqlConnection(" MultipleActiveR esultSets=True; Persist
Security Info=False;User ID=sa;Password= pwd;Initial Catalog=tempdat abase")
"Peter" <Pe***@discussi ons.microsoft.c omschreef in bericht
news:DF******** *************** ***********@mic rosoft.com...
I'm using this coding to get 2 resultsets thru datareader and then load
them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that
possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Peter,
If you change this:
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
to this:
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
then I think it will work.
Kerry Moorman
"Peter" wrote:
I'm using this coding to get 2 resultsets thru datareader and then load them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hi Michel,
I have tried setting this to true or false and has no effect. I'm
connecting to SQL Server 2005 and I believe MARS is true by default.
The coding suddenly works after I removed the If statement from the
following coding:
Original coding:
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Revised coding:
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
This is kind of confusing since I think I'm getting multiple resultsets and
need to the NextResult method to move to next resultset. With the revised
coding, I have tried both MARS=true and MARS=fales and it works on both
settings.
Peter
"Michel Posseth [MCP]" wrote:
Hello Peter ,
did you set the MARS parameter to true in the connection string ?
Dim objConn As New SqlConnection(" MultipleActiveR esultSets=True; Persist
Security Info=False;User ID=sa;Password= pwd;Initial Catalog=tempdat abase")
"Peter" <Pe***@discussi ons.microsoft.c omschreef in bericht
news:DF******** *************** ***********@mic rosoft.com...
I'm using this coding to get 2 resultsets thru datareader and then load
them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that
possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hi Kerry,
It works but I have no idea why. I believe my coding was originally
without the If sdrGrid.NextRes ult() = True and it didn't work. So, I tried
the NextResult coding but still not working.
Peter
"Kerry Moorman" wrote:
Peter,
If you change this:
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
to this:
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
then I think it will work.
Kerry Moorman
"Peter" wrote:
I'm using this coding to get 2 resultsets thru datareader and then load them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hi Michel,
I think my case is not multiple ACTIVE resultsets. My case is simply a
batch which return multiple resultsets. I have not found any articles
explaining the difference between them. But the MARS parameter will only
have effect if I try to use 2 datareaders without closing the 1st datareader.
Peter
"Michel Posseth [MCP]" wrote:
Hello Peter ,
did you set the MARS parameter to true in the connection string ?
Dim objConn As New SqlConnection(" MultipleActiveR esultSets=True; Persist
Security Info=False;User ID=sa;Password= pwd;Initial Catalog=tempdat abase")
"Peter" <Pe***@discussi ons.microsoft.c omschreef in bericht
news:DF******** *************** ***********@mic rosoft.com...
I'm using this coding to get 2 resultsets thru datareader and then load
them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that
possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
Hi Kerry,
I think I find out the reason why NextResult is not needed. The
datatable.load will position to the next resultset automatically.
Peter
"Kerry Moorman" wrote:
Peter,
If you change this:
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
to this:
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
then I think it will work.
Kerry Moorman
"Peter" wrote:
I'm using this coding to get 2 resultsets thru datareader and then load them
into 2 datatables and bind the datatables to datagridviews. But
sdrGrid.NextRes ult() is returning false for some reason. Is that possible
the connection is closed?
Dim strConn As String = "Server=localho st;Database=nor thwind;" + _
"Integrated Security=SSPI"
Dim cnnNwind As SqlConnection = New SqlConnection(s trConn)
Try
Dim strSql As String = "select * from customers;selec t * from
products"
Dim cmdGrid As New SqlCommand(strS ql, cnnNwind)
cmdGrid.Command Type = CommandType.Tex t
cnnNwind.Open()
Dim sdrGrid As SqlDataReader = cmdGrid.Execute Reader
Dim dt1 As New DataTable
dt1.Load(sdrGri d)
DGVP.DataSource = dt1
Dim dt2 As New DataTable
If sdrGrid.NextRes ult() = True Then
dt2.Load(sdrGri d)
DGVC.DataSource = dt2
End If
Catch exc As Exception
MsgBox(exc.Mess age)
Finally
cnnNwind.Close( )
End Try
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