CodeSnip: Pivot Tables with ADO.NET and Display in a DataGrid Paged Horizontally: ASP Alliance

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CodeSnip: Pivot Tables with ADO.NET and Display in a DataGrid Paged Horizontally

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by Steve Sharrock
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Pivot DataTable

[Download Code]
The output of the pivot method is a new DataTable with one row for each column of the input table, and one column for each Product represented by the rows of the input table. To simplify this example, we assume that the "Product" column is the first column of each row (Column[0]), and the remaining columns represent the features.

The first step is to create the new DataTable and its schema from the rows of the input table. The first column is for the Feature description, and the remaining columns are the Product names found in each row of the input. In the following code snippet, source refers to the input table and dest is the new pivoted table.

 
DataTable dest = new DataTable("Pivot" + source.TableName ); 
// 1st column is for the feature descriptions 
dest.Columns.Add( "Features" );
// the remaining columns are Product Description 
// from each source table row (1st column) 
foreach( DataRow r in source.Rows ) 
dest.Columns.Add( r[0].ToString() ); 
// assign each row the Product name

Now that we have the appropriate columns defined in the schema of the destination table, the next step is to create a DataRow for each feature defined in the columns of the source table, excluding the first column representing the Product name.

 
for( int i = 0; i < source.Columns.Count - 1; i++ ) 
dest.Rows.Add( dest.NewRow() );

The final step is the actual transform of the columns from the source rows into the destination table. Since each table now represents a two dimensional array of its rows and columns, a very simple transform of all columns and rows could be performed by the following nested for loop.

for( int r = 0; r < dest.Rows.Count; r++ ) 
for( int c = 0; c < source.Columns.Count; c++ ) 
dest.Rows[r][c] = source.Rows[c][r];

However, this simple loop doesn't account for the first column of the destination representing the Feature description from the source columns. So we modify the code slightly as shown in this code snippet.

for( int r = 0; r < dest.Rows.Count; r++ ) 
for( int c = 0; c < source.Columns.Count; c++ ) 
if ( c == 0 ) dest.Rows[r][0] = source.Columns[r + 1].ColumnName; 
else dest.Rows[r][c] = source.Rows[c - 1][r + 1];

Now that we have our pivoted DataTable ready to display, we could simply bind it to a DataGrid; however, our client wants the DataGrid to page, rather than scroll horizontally to show a limited number of products on each page. The technique used to implement this feature is illustrated on the next page.

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User Comments

Title: Resuelto facil
Name: Demo Atencia
Date: 2013-01-09 2:41:23 AM
Comment:
Protected Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim tabla As DataTable
Dim tablapersonas As DataTable
tablapersonas = objcl.Lista_Personas_Bono(cboProyectos.SelectedValue)
'tabla=objeto datatable
GridView1.DataSource = PivotTable(tabla)
GridView1.DataBind()

End Sub
Public Function PivotTable(ByVal [source] As DataTable) As DataTable
Dim dest As New DataTable("Pivoted" + [source].TableName)

dest.Columns.Add(" ")

Dim r As DataRow
For Each r In [source].Rows
dest.Columns.Add(r(0).ToString())
Next r
Dim i As Integer
For i = 0 To ([source].Columns.Count - 1) - 1
dest.Rows.Add(dest.NewRow())
Next i

For i = 0 To dest.Rows.Count - 1
Dim c As Integer
For c = 0 To dest.Columns.Count - 1
If c = 0 Then
dest.Rows(i)(0) = [source].Columns((i + 1)).ColumnName
Else
dest.Rows(i)(c) = [source].Rows((c - 1))((i + 1))
End If
Next c
Next i
dest.AcceptChanges()
Return dest
End Function 'PivotTable

mas simple ni en la china... saludos

Title: Web Team
Name: Mani Maran M
Date: 2012-09-24 12:14:49 AM
Comment:
This is really super.Thanks a lot for publishing this article....

Title: Broken source data link
Name: Sebastian
Date: 2012-06-06 7:09:49 PM
Comment:
Hoping to see an answer could you please upload again and reload the source data link please.

Title: Missing source data
Name: Sierk
Date: 2012-05-10 4:21:57 PM
Comment:
I know this is old, but the link to the source data is no longer available and I am trying to figure out what the source.TableName from DataTable dest = new DataTable("Pivot" + source.TableName ); is. Could you have the source code restored or add the missing parts?

Thanks

Title: Can U attach source code please
Name: punk
Date: 2010-07-25 10:09:52 AM
Comment:
Can U attach souce code please, cos, there's an error on Download Code link.

Title: Some extra tools
Name: redbull
Date: 2010-02-12 10:07:41 PM
Comment:
http://viblend.com/blog/post/2010/01/13/Creating-a-Pivot-Table-in-Silverlight-using-XAML.aspx

Title: Attachable to a queried datasource?
Name: lduhon@me.com
Date: 2009-10-29 11:13:48 AM
Comment:
Thank for the informative article, though I do have one question. In your example, you've embedded your sample data in the code file. What needs to be changed to make use of this with a SqlDataSource instead of the embedded DataTable.

Thank you again.

Title: Display Coffee Table
Name: blogcomment1@googlemail.com
Date: 2009-08-11 9:08:46 AM
Comment:
Hello. Thanks for the guide. But why it always say that there's an error?!. Thanks and have a nice day. :)

Title: plz help anyone
Name: sachin kumar
Date: 2008-09-25 3:17:32 AM
Comment:
Just I want that data come from any data source but my datagrid heading column name will come in xml data file

Title: I cannot be the only one to get this error
Name: Ralphxyz
Date: 2008-09-11 10:46:02 AM
Comment:
Parser Error Message: Could not load type 'Pivot.Demo'.

Where oh where is "Pivot.Demo"

Certainly not in in the code download!

Title: display image problem
Name: Rajeev Gangwar
Date: 2008-05-13 4:15:27 AM
Comment:
Please tell me is there any option for binding the image in the datagrid using pivot table. thanks

Title: Asp.Net(C#)
Name: Rajasekar
Date: 2008-03-12 9:26:40 AM
Comment:
I need to bind the Repeated columns values in Single Columns

Title: Not useful to show images
Name: garima
Date: 2008-01-28 4:04:44 AM
Comment:
how can we retrieve images from database and display on a grid page with the help of pivot table.

Title: Not Useful in Real World
Name: Ron Jeremy
Date: 2007-11-27 8:53:25 PM
Comment:
WHo has pivot tables that don't have fields of the same value? You sample doesn't support datafields that have the same values for multiple fields.

The concept is OK, but you need to add some logic.

Title: Problem where the left col has multple of same values
Name: Lee
Date: 2007-08-24 5:10:45 PM
Comment:
Great for very basic pivots. however i have data like this.
Date Qty failure
2007-04-23 2 Damaged Leads
2007-04-23 120 Improper fillet
2007-04-23 34 Non-wetting
2007-04-23 7 Solder missing
2007-04-23 1 Imp hardware mounting
2007-04-23 3 CONTAM
need to see as
2004-04-23
Damaged Leads 2
Improper fillet 120
Non-wetting 34
Solder missing 7
Imp hardware mounting 1
CONTAM 3

Title: ASP.NET 2.0 Code
Name: Alloyd
Date: 2007-05-27 7:17:59 PM
Comment:
Were would I get VB.Net version of the code to use on an ASP.NET page. I have used a C to VB conversion utility to convert the code, but I have a type mis-match I can't solve in the BindHorzGrid Sub. Here CodeSnip:

' frist create the "anchored" column[0] -- Product
Dim c As BoundColumn = New BoundColumn()
c.HeaderText = pivotTbl.Columns(0).ColumnName
c.HeaderStyle.Font.Bold = True
c.DataField = pivotTbl.Columns(0).ColumnName
c.ItemStyle.Font.Bold = True
pageGrid.Columns.Add(c)

The type mis-match error is:

"Value of type 'System.Web.UI.WebControls.BoundColumn' cannot be converted to 'System.Web.UI.WebControls.BataControlField'"

Title: special case
Name: Ali
Date: 2007-04-18 2:08:24 AM
Comment:
Nice article. But there is a problem when you have repeated columns (repeated products)

Title: CodeSnip: Pivot Tables with ADO.NET and Display in a DataGrid Paged Horizontally
Name: Donna
Date: 2007-01-23 3:13:43 PM
Comment:
Excellent!! Thanks for the VB.net version, this works great!

Title: CodeSnip: Pivot Tables with ADO.NET and Display in a DataGrid Paged Horizontally
Name: PJackson
Date: 2006-11-18 9:51:50 AM
Comment:
Thanks. I like the simplicity. PJ

Title: great pivot table
Name: CSutherland
Date: 2006-11-06 1:34:47 PM
Comment:
Hey thanks for the great article!
I'm trying to do something exactly like this and its a great example you have. Props!

Title: Great
Name: APetcu
Date: 2006-09-13 3:52:08 AM
Comment:
Plain and simple. Thanks!

Title: ok
Name: mgv
Date: 2006-09-01 4:28:45 AM
Comment:
not upto the mark try somewhat and get a better ones .

Title: Great article
Name: Stephan
Date: 2006-07-07 6:09:08 AM
Comment:
Steve, thank you for this article. It was of great help to me. This saved me time to program something simular

Title: hello
Name: great
Date: 2006-04-04 2:02:11 AM
Comment:
it works!

Title: Indian
Name: KiranKumar.P
Date: 2006-03-28 12:29:57 PM
Comment:
thank you steve sharrock. Its very useful code for .net developers;

Title: Software Engineer
Name: John McPherson
Date: 2006-03-06 2:57:09 PM
Comment:
I'm relatively new at vb.net and asp.net but I found what I was looking for...

Thank you.

Regards,

"Sufficiently advanced technology is indistinguishable from magic." - Arthur C. Clark, inventor of the telecommunications satellite

Title: JavaScript Pivot Tables
Name: Nick
Date: 2006-02-04 7:35:22 PM
Comment:
For an example of how to rearrange multidimensional tables using JavaScript, check out http://www.jnetiq.com

Title: vb.net version of the pivot table function
Name: Chris
Date: 2005-12-20 11:25:58 AM
Comment:
Here is the vb.net version of the pivot table function:

Public Function PivotTable(ByVal source As DataTable) As DataTable
Dim dest As DataTable = New DataTable("Pivoted" + source.TableName)

' create shchema (string columns) for the destination
' the first column is for the source column name
dest.Columns.Add(" ")

' the remaining dest columns are from each source table row (1st column)
Dim r As DataRow
For Each r In source.Rows
dest.Columns.Add(r(0).ToString())
Next

' now add one row to the dest table for each column in the source, except
' the first which is the Product, in our case
Dim i As Integer
For i = 0 To source.Columns.Count - 1 - 1 Step i + 1
dest.Rows.Add(dest.NewRow())
Next

' now move the source columns to their position in the dest row/cell matrix
' starting down the destination rows, and across the columns
Dim rr As Integer = 0
Dim c As Integer = 0
For rr = 0 To dest.Rows.Count - 1 Step rr + 1
For c = 0 To dest.Columns.Count - 1 Step c + 1
If c = 0 Then
dest.Rows(rr)(0) = source.Columns(rr + 1).ColumnName ' the Product name
Else
dest.Rows(rr)(c) = source.Rows(c - 1)(rr + 1)
End If
Next
c = 0
Next
dest.AcceptChanges()
Return dest
End Function

Title: pivot Table demo
Name: manish punwani
Date: 2005-12-02 7:50:15 AM
Comment:
this was very helpful
thanks a lot
rgds
manish

Title: database conectivity
Name: arvind
Date: 2005-03-15 12:29:28 PM
Comment:
how to attach a table of oracle in a aspx page in C#.net project.

Title: CodeSnip: Pivot Tables with ADO.NET and Display in a DataGrid Paged Horizontally
Name: Alejandro Cuellar Gaxiola
Date: 2005-01-28 7:15:50 AM
Comment:
This is an excellent article showing a very elegant way to pivot a table and how to manage the grid to present the data.

Title: but what about image
Name: vishal
Date: 2004-12-03 6:42:57 AM
Comment:
but what about images if i wants to display on the first row.
when i tried and , when i wants to add first row than i am unable to retrieve values from database as i store image in byte() format

how can we retrieve images from database and display on a grid page with the help of pivot table.

Title: VB.NET Code
Name: Steve
Date: 2004-11-09 8:27:32 AM
Comment:
Here are a few links to various tools that will convert C# to VB.

http://authors.aspalliance.com/aldotnet/examples/translate.aspx

http://www.developerfusion.com/utilities/convertcsharptovb.aspx

http://www.kamalpatel.net/

http://w1.311.telia.com/~u31115556/desc/programs.htm#BabbelFisken

Title: VB.NET demo
Name: Bob
Date: 2004-11-09 7:20:30 AM
Comment:
Could you supply VB.NET demo code also?