How To Convert A Datareader To Datatable

Feb 23, 2012

I have a question about converting a datareader to a datatable. In my code, I have a datareader created in one class and passed to another class that I want to convert it to a datatable.

When I do this, it does not seem to work, as the table remains empty. If I do the conversion in the same function, it works fine.

Its only when I pass the datareader to another function that it stops working. Is this because the dr is closed or something? How do I overcome this problem? Any help would be great.

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.net - Fill DataTable From DataReader Row By Row

Aug 25, 2010

i want to fill a Datatable with a Datareader row by row but get an exception because the reader's columns have a different order than the Datatable's columns.

Why and how does a Datatable loads itself with a Datareader correctly, even so it has a column collection with different order?

I need to calculate values for every row so i dont want to load the Datatable completely but row for row. It has 25 columns so i dont want to set it all manually.

There must be a chance to load/fill/add a new row from a datareader without having the same column order(reader.GetSchemaTable?).

Following is what i have but what doesnt work:

Using reader As System.Data.SqlClient.SqlDataReader = command.ExecuteReader
'next line works(configInfo.DataSource is a Datatable)but is inappropriate


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Load DataReader Into DataTable?

Jul 7, 2009

[code]...Load DataReader into DataTable

This code return an error, and with breakpoint i get this error on the items line:

"Item = In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user."

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VS 2008 Filling DataTable With DataReader?

Feb 19, 2010

I use firebird server for 2 years and I used this code


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How To Convert CSV File To Datareader

Oct 20, 2011

How to convert CSV file to datareader?I google it but only find out how to convert datareader to CSV file.

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VS 2010 : Create Multi-dimensional Array From Datareader From Datareader?

Feb 20, 2012

I have an SQL statement like:


How do I create a multi-dimensional array from a datareader which should store values like:

John, Doe, LA
Mike, Johnson, PASADENA
Freddy, Kruger, Long Beach

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Convert A Datatable Using A Reference Datatable

Apr 26, 2012

I am finding difficulties to convert a datatable to a new datatable using a reference datatable. My question is confusing and I am not good at explaining things so I drew a picture (see below).I have two datatables on memory and I need to create the third datatable using the second mapping table for reference. The column names are just for example and it can't be hardcoded.

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Datareader - Error - "there Is A Datareader Associate With This Connection That Need To Be Closed"

Aug 17, 2009

I have a problem with my project. here is the problem:

My code for login is as follows:

dim conn as SqlConnection = New SqlConnection("Data Source.................)
dim cmd as SqlCommand = New SqlCommand("Loguser",conn)
cmd.CammandType = CommandType.StoredProcedure


Now the error i get is that "there is a datareader associate with this connection that need to be closed"

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How To Fill A DataTable With A List(Of T) Or Convert A List(Of T) To A DataTable

Nov 26, 2009

I have read many posts on this topic; among them and most recently .NET - Convert Generic Collection to Data Table. Unfortunately, all to no avail.

I have a generic collection of structures :

Private Structure MyStruct
Dim sState as String
Dim lValue as Long
Dim iLayer as Integer
End Structure

Dim LOStates As New List(Of MyStruct) I need to fill a DataTable with this list of structures but have no idea how to go about doing this. I am using in Visual Studio 2008.

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.net - Convert DataTable To Linq?

Feb 10, 2010

I'm trying to convert DataTable to Linq using

DIm result = From r in dt.AsEnumerable()
Select new ( col1 = r.Field<integer>("id"), col2 = r.Field<string>("desc"))

But i get error near 'new (' saying type expected.

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C# - How To Convert Listview To DataTable

Jun 22, 2012

I have seen many examples of populating a listview from a datatable or converting a datatable to a listview but what I am trying to do is exactly the other way around.

How can I convert/copy the contents of a winform listview to a datatable?


I have a listview with a context menu where users can multiselect items and choose one of the context menu options, I then loop the selected items and extract each selected row (listview item) and serialize it, instead of doing this I wanted to convert the listview to a datatable then add the datatable to a dataset and serialize the dataset.

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Convert A DataTable To List (of T)?

Apr 28, 2012

convert a dataTable to List(of T).In on .Net 3.5 If you know How To or maybe a link of somebody who did it.I check this on c# (from another stack question)

public static IEnumerable<T> ToEnumerable<T>(DataTable dt, Func<DataRow, T> translator)
foreach(DataRow dr in dt.Rows)


but I cant translate Func on .net 3.5?

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Convert Csv Data To DataTable?

Jun 20, 2012

I am trying to import a large array of integers stored as a csv file into a VB.Net DataTable called BeamMap. The .csv file consists only of integers, with a delimiter of ,, no quotes around the data (ie., 1,3,-2,44,1), and an end of line character of line feed and carriage return. All I want to do is get each integer into a DataTable cell with the appropriate rows and columns (there are the same number of columns for each row) and be able to reference it later on in my code. I really don't want anything more than absolutely necessary in the code (no titles, captions, headings, etc.), and I need it to be fairly efficient (the csv array is approx. ~1000 x ~1000).

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Convert Datagridview To Datatable?

May 21, 2012

I managed to Convert a Datagridview to Datatable, Now problem is the programmatically addded Columns Seem to end up at the end of the of the initial table layout[code]...

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Convert Xml File To Datatable?

Dec 31, 2009

i am using following code to convert xml file to datatable but its just creating multiple tables (but without data) and i want tables with data..

Dim myDS As New DataSet
Dim xmlStream As System.IO.StreamReader = New System.IO.StreamReader(Server.MapPath("~xmldoc

View 1 Replies - Getting Error And Cannot Convert String To Datatable?

Jan 27, 2012

I am getting this error cannot convert string to datatable

The code is

dt = CType(Session("result"), DataTable)

I am trying to store the session value in dt which is a datatable. The session result contains string to convert the session to datatable and store the session value in the datatable.

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Convert A List To Dataset Or Datatable?

Jun 5, 2011

I need to convert bindiangsource.datasource (which is a list) to dataset or datatable.

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Datatable - Convert String To Double?

Jun 21, 2012

data table contain column named as Fld_primary. this column contain value like 0.00 it is double datatype in mysql table.i want store that datatable value in double variable. am always getting error when i convert to double datatype.

my code
Dim ds5 As dataset1.DTSUMDataTable = TA5.GetData(users)
Dim dttot As Double
dttot = CType(ds5("fld_primary").ToString, Double)

Error:Conversion from string "fld_primary" to type 'Integer' is not valid.

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Datatable Convert To Xml And Export To Excel?

Aug 1, 2012

May I know is there anyone did this before? I have the code below: Private Function FnReadWeeklyConsumption(ByVal pstrSheetName As String,


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VS 2010 : Convert Datatable To JSON?

Mar 26, 2011

I want to be able to turn a datatable or dataset or the results of my SQL queries into JSON - purpose is for a WCF service which will not do it.

View 2 Replies - Extract/convert Information From A Listview (to A DataTable)?

Jan 4, 2010

I have a relatively simple Listview that suddenly needs (due to new requirements) to have it's 'layout' extracted to a DataTable so that a common routine can convert it to an Excel spreadsheet for export purposes.The ItemTemplate is just a series of Table Rows with some text, data-bound labels and textboxes with validators in the cells.Usually, when trying to pull out a particular value (like what was entered into a text box), I use the ListViewItem's .FindControl method.

For Each objItem As ListViewItem In lvwOptions.Items
Dim objTextHrsLabor As TextBox = CType(objItem.FindControl("txtHrsOptByLabor"), TextBox)
decHours = CDec(objTextHrsLabor.Text)

In this case, however, I'm trying to take all the data displayed - all the 'rows and columns' of the table that was created.Inside the ForEach / Next loop of ListViewItems, I started a ForEach/Next loop of Controls for each instance's controls but I got some really strange results returned (like controls that had a couple of table cells in them).

I get the sense I'm headed in the wrong direction. All I want is for the nicely-formatted 5-line, 6 column table to be converted to a 5-line, 6-column data table.

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Convert 10 Lines With Three Columns Into A DataSet/DataTable?

Mar 8, 2011

I'm using / winforms.How can I convert 10 lines with three columns into a DataSet/DataTable?

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Convert A LINQ Query Resultset To A DataTable?

Jul 20, 2010

How can i write this query with LINQ to a FoxPro database?SELECT count(*) FROM Table group by item1I wrote it as below, but it doesn't work

Dim Query
Dim dt As New DataTable
Dim da = New Odbc.OdbcDataAdapter("SELECT * FROM table1",connection)


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Convert Datatable Byte Array To Image?

Mar 6, 2009

I've created a new access 2007 database + added a OLE Object field, that i've then pasted images vb2008 I've connected to the database + put the table into a datatable. so far it works ok.when i try to convert the byte array to an image, it causes an error:

'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'heres the code i'm using[code]....

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Convert Single Column Of A DataTable To Program?

Aug 22, 2011

Using VB.NET, what is the most concise way to convert a single column of a DataTable to a CSV? The values are integers, so I don't need to worry about character escaping or encoding.

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DB/Reporting :: Datatable.compute("Sum(Convert?

Oct 25, 2009

I need help with this line of code: Me.avgsalespricetxt.Text = Me.dtsold.Compute("AVG(Convert([Selling Price]),'System.Int32'))")

Here is all the code i have so far, I need to Average a column in my datatable from what i have read "Compute method supports expressions and they support CONVERT function that you could use inside of the expression."


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LINQ To DataSet - Convert EnumerableRowCollection Into DataTable

Mar 2, 2012

I am trying to convert my EnumerableRowCollection into a DataTable, but I can't see the CopyToDataTable method. The enm.CopyToDataTable() has the blue saw tooth line under it with error saying " 'CopyToDataTable' is not a member of 'System.Data.EnumerableRowCollection' ". I have set a Reference to System.Data, System.Data.Linq, and System.Data.DataSetExtensions. I thought the CopyToDataTable method was part of the System.Data.DataSetExtensions, right? Anyone know why I can't access this method?


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VS 2010 Convert System.Object To Datatable Or Array?

Jul 18, 2011

I'm pulling data from a D3 database, using an api.

The api can do the following: Dim OBJ As Object = mvsp.MVResultSetGetRows.ToArray()

But how do I get that data into a datatable to use as the datasource for a DataGridView?

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[2008] Convert Datatable Byte Array To Image?

Mar 6, 2009

i've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.

in vb2008 i've connected to the database + put the table into a datatable. so far it works ok.

when i try to convert the byte array to an image, it causes an error:

'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'

heres the code i'm using:


Dim arr() As Byte = DirectCast(record.Item(5), Byte())
pic.Image = Image.FromStream(New IO.MemoryStream(arr))

its loading the byte array properly, but the Image.FromStream line causes the error. i've used this method before with an earlier access database + it works.

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Convert A JSON Constructed From Table To A Datatable For An Update Query?

Jan 29, 2011

I would like to send json data from a HTML table to the ASP.NET code-behind and update the data in and SQL Server database. The code and JSON for the TableProductToUpdate() is below.

function UpdateProductTable() {
type: "POST",


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