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export datatable to excel

cj2
#1 Is there a quick way to export a datatable to an excel file? Or
delimited file?

#2 Where is the appropriate Microsoft monitored group to ask about
writing reports in SQL Reporting services or SQL Server Business
Intelligence Development Studio or whatever it's called?
Sep 11 '08
19 11245
cj2
What is the difference between grid.datasource and grid.datamember ?

I found since I am using a datatable to hold the info I want in an excel
spreadsheet that I can do grid.datasource =mydt and don't have to use
datamember. But I'd like to know why.
Ji Zhou [MSFT] wrote:
Hello Chris,

If we want to use the System.Web.UI.W ebControls in the console or windows
form VB.NET application. We need to add a reference to System.Web assembly.
To reference this assembly in VB.NET 2008, we open the Solution Explorer
Window, right click our project and choose Add Reference option. Then, the
Add Reference dialog pops up. In the .NET tab, we find and select the
System.Web, and click the OK button. Afterwards, we can use the
System.Web.UI.W ebControls.Data Grid.

Please let me know if you have future questions or concerns on this. I will
be more than glad to provide future help!
Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no rights.
Sep 23 '08 #11
Hello Chris,

The DataGrid.DataMe mber is inherited from the BasedDataList class. We can
find the related document in this link:
http://msdn.microsoft.com/en-us/libr...ols.basedatali
st.datamember.a spx.

The description for it is "Gets or sets the specific data member in a
multimember data source to bind to a data listing control." Thus, we can
know that this property is used only when the data source is a multimember
one.

1.If we use a DataTable to set the DataSource property. The data source is
single member, so we do not need the DataMember property in this case.

2.If we set a DataSet as the data source which is multimember, we can use
DataMember to specify which table in that dataset is supposed to be bound
to the control.

Hope this clarifies the issue. Please feel free to let me know if you have
future questions on this. I am glad to be of assistance.

Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no rights.

Sep 24 '08 #12
On Sep 12, 1:37*pm, "\"Ji Zhou [MSFT]\"" <v-j...@online.mic rosoft.com>
wrote:
Hello Chris,

Thanks for using Microsoft Newsgroup Support Service, my name is Ji Zhou
[MSFT] and I will be working on this issue with you.

As to your first question, we have the following three solutions to export
the data from a datatable into an Excel file:

1.Using Office automation as Gillard's code shows. In this approach, each
row in the datatable will cost one Excel COM server call. So the speed isa
little slow.

2.We can put the datatable in a System.Web.UI.W ebControls.Data Grid control
and use the DataGrid's RenderControl function to export the data into an
Excel file. There is a sample article about this approach in code project:http://www.codeproject.com/KB/office...DataTable.aspx

3.We take the Excel file as a database and use OleDbConnection to connectto
it. After that, we can update our datatable to the Excel file database. The
following Microsoft KB article dedicate to this method:http://support.microsoft.com/kb/316934
4. Use some 3rd party Excel RW component.

Our GemBox.Spreadsh eet Free Excel component
(http://www.gemboxsoftware.com/GBSpreadsheetFree.htm)
can be used free of charge for that task,
as long as XLS/CSV/XLSX files are not large.
You have ExcelWorksheet. InsertDataTable method
(http://www.gemboxsoftware.com/help/
GemBox.Spreadsh eet.ExcelWorksh eet.InsertDataT able_overload_2 .html)
which does exactly what you need.

--Zeljko
Sep 24 '08 #13
cj2
That makes sense however I would have expected to do something like this
with a dataset.

grid.datasource = myds.table("myt able")

I would have thought that they would have had only one datasource for
the gid.

P.S. I know this is off the subject but is it also possible to export
the grid to a CSV file? While adequate opening the HTML in excel
doesn't look like excel files normally look.
Ji Zhou [MSFT] wrote:
Hello Chris,

The DataGrid.DataMe mber is inherited from the BasedDataList class. We can
find the related document in this link:
http://msdn.microsoft.com/en-us/libr...ols.basedatali
st.datamember.a spx.

The description for it is "Gets or sets the specific data member in a
multimember data source to bind to a data listing control." Thus, we can
know that this property is used only when the data source is a multimember
one.

1.If we use a DataTable to set the DataSource property. The data source is
single member, so we do not need the DataMember property in this case.

2.If we set a DataSet as the data source which is multimember, we can use
DataMember to specify which table in that dataset is supposed to be bound
to the control.

Hope this clarifies the issue. Please feel free to let me know if you have
future questions on this. I am glad to be of assistance.

Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no rights.
Sep 24 '08 #14
yes it is

Sub export2csv(ByVa l dtgv As DataGridView)
Dim str As String = String.Empty
For x = 0 To dtgv.RowCount - 1
For y = 0 To dtgv.Columns.Co unt - 1
str = str & dtgv.Item(y, x).Value & ";"
Next
str = str.Remove(str. Length - 1, 1)
str = str & vbCrLf
Next
Dim sdf As New SaveFileDialog
sdf.Filter = "Coma Separated value(*.csv)|*. csv"
sdf.AddExtensio n = True
sdf.DefaultExt = "csv"
If sdf.ShowDialog = Windows.Forms.D ialogResult.OK Then
My.Computer.Fil eSystem.WriteAl lText(sdf.FileN ame, str, False)
End If
End Sub

"cj2" <cj*@nospam.nos pamwrote in message
news:eX******** ******@TK2MSFTN GP06.phx.gbl...
That makes sense however I would have expected to do something like this
with a dataset.

grid.datasource = myds.table("myt able")

I would have thought that they would have had only one datasource for the
gid.

P.S. I know this is off the subject but is it also possible to export the
grid to a CSV file? While adequate opening the HTML in excel doesn't look
like excel files normally look.
Ji Zhou [MSFT] wrote:
>Hello Chris, The DataGrid.DataMe mber is inherited from the BasedDataList
class. We can find the related document in this link:
http://msdn.microsoft.com/en-us/libr...ols.basedatali
st.datamember. aspx. The description for it is "Gets or sets the specific
data member in a multimember data source to bind to a data listing
control." Thus, we can know that this property is used only when the data
source is a multimember one. 1.If we use a DataTable to set the
DataSource property. The data source is single member, so we do not need
the DataMember property in this case. 2.If we set a DataSet as the data
source which is multimember, we can use DataMember to specify which table
in that dataset is supposed to be bound to the control.

Hope this clarifies the issue. Please feel free to let me know if you
have future questions on this. I am glad to be of assistance.

Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you.
Please feel free to let my manager know what you think of the level of
service provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no
rights.
Sep 24 '08 #15
Hello all,

Gillard, thanks for your posting! Yes, I totally agree your approach. It is
a good and easy way to export data from the datatable to a csv file. Only
one more thing to mention is that a string in .Net Framework is immutable.
That means it cannot be modified in the place. Any modifications to a
string will cause a new string is allocated. Afterwards, the value of
original one will copied into the new string. So, if there is a lot of data
in our datatable, we'd better use StringBuilder to get a better performance.

See the following KB article regarding to this topic,
http://support.microsoft.com/kb/306821

And Chris, please let us to know if this approach addresses your issue. If
you have any questions on this, I will do my best to provide the future
help.
Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no rights.

Sep 25 '08 #16
ok thank you Ji Zhou
I will modify the code if i have a big datagrid
""Ji Zhou [MSFT]"" <v-****@online.mic rosoft.comwrote in message
news:RQ******** ******@TK2MSFTN GHUB02.phx.gbl. ..
Hello all,

Gillard, thanks for your posting! Yes, I totally agree your approach. It
is
a good and easy way to export data from the datatable to a csv file. Only
one more thing to mention is that a string in .Net Framework is immutable.
That means it cannot be modified in the place. Any modifications to a
string will cause a new string is allocated. Afterwards, the value of
original one will copied into the new string. So, if there is a lot of
data
in our datatable, we'd better use StringBuilder to get a better
performance.

See the following KB article regarding to this topic,
http://support.microsoft.com/kb/306821

And Chris, please let us to know if this approach addresses your issue. If
you have any questions on this, I will do my best to provide the future
help.
Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no
rights.
Sep 25 '08 #17
cj2
Thanks to both of you. Gillard, if you modify the code how about
posting the new code for me. I haven't worked with stringbuilder. I'm
sure I could figure it out but it'd be nice to see your code.

Now I must admit, I've been pulled to a new task this AM which I expect
will take awhile. So, I don't think I'll be working on this for awhile now.

Gillard wrote:
ok thank you Ji Zhou
I will modify the code if i have a big datagrid
""Ji Zhou [MSFT]"" <v-****@online.mic rosoft.comwrote in message
news:RQ******** ******@TK2MSFTN GHUB02.phx.gbl. ..
>Hello all,

Gillard, thanks for your posting! Yes, I totally agree your approach.
It is
a good and easy way to export data from the datatable to a csv file. Only
one more thing to mention is that a string in .Net Framework is
immutable.
That means it cannot be modified in the place. Any modifications to a
string will cause a new string is allocated. Afterwards, the value of
original one will copied into the new string. So, if there is a lot of
data
in our datatable, we'd better use StringBuilder to get a better
performance.

See the following KB article regarding to this topic,
http://support.microsoft.com/kb/306821

And Chris, please let us to know if this approach addresses your
issue. If
you have any questions on this, I will do my best to provide the future
help.
Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you.
Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no
rights.
Sep 25 '08 #18
I will write it when I will need it
not now
sorry for you pal

"cj2" <cj*@nospam.nos pamwrote in message
news:#N******** ******@TK2MSFTN GP05.phx.gbl...
Thanks to both of you. Gillard, if you modify the code how about posting
the new code for me. I haven't worked with stringbuilder. I'm sure I
could figure it out but it'd be nice to see your code.

Now I must admit, I've been pulled to a new task this AM which I expect
will take awhile. So, I don't think I'll be working on this for awhile
now.

Gillard wrote:
>ok thank you Ji Zhou
I will modify the code if i have a big datagrid
""Ji Zhou [MSFT]"" <v-****@online.mic rosoft.comwrote in message
news:RQ******* *******@TK2MSFT NGHUB02.phx.gbl ...
>>Hello all,

Gillard, thanks for your posting! Yes, I totally agree your approach. It
is
a good and easy way to export data from the datatable to a csv file.
Only
one more thing to mention is that a string in .Net Framework is
immutable.
That means it cannot be modified in the place. Any modifications to a
string will cause a new string is allocated. Afterwards, the value of
original one will copied into the new string. So, if there is a lot of
data
in our datatable, we'd better use StringBuilder to get a better
performance .

See the following KB article regarding to this topic,
http://support.microsoft.com/kb/306821

And Chris, please let us to know if this approach addresses your issue.
If
you have any questions on this, I will do my best to provide the future
help.
Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments
and
suggestions about how we can improve the support we provide to you.
Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no
rights.
Sep 25 '08 #19
Hello Chris,

I used the following code to import my data table into the .csv file. I did
not use the String to cache the items. I just used stream writer to output
each item in the loop. See the following code,

Dim dt As DataTable = Me.NorthwindDat aSet.Tables("Cu stomers")
Using sw As New System.IO.Strea mWriter("D:\tes t.csv")
For i = 0 To dt.Rows.Count - 1
For j = 0 To dt.Columns.Coun t - 1
sw.Write("""" + dt.Rows(i).Item (j) + """")
sw.Write(",")
Next
sw.Write(sw.New Line)
Next
End Using

Please let me know if you have any future questions or concerns on this
issue, and I will do my best to research.

Best regards,
Ji Zhou (v-****@online.mic rosoft.com, remove 'online.')
Microsoft Online Community Support

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
ms****@microsof t.com.

This posting is provided "AS IS" with no warranties, and confers no rights.

Sep 26 '08 #20

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