Assign A Populated Datatable's Columns To Another Empty Datatable?

May 28, 2007

Is there a simple way to assign a populated datatable's columns to another empty datatable? That is, I want to copy a datatable's structure only but not its data.

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.net - ImportRow From DataTable To Another And Still Destination DataTable Is Empty?

Apr 7, 2012

I'm trying to copy one row from DataTable to another, I looked almost everywhere and I can't find a reason why this is happening, I'm using ImportRow and still the New DataTable is empty. Here's one of the answers similar I found and It's still not working!:

Dim newTable As New DataTable
Dim dsFrom As New DataTable
For Each DBShoes In list
Dim iShoeID As Integer


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Using DataTable Populated With A Sqldataadapter?

Nov 24, 2010

I am fairly inexperienced with using datatables in VB. My question is this: Can I access a particular column of a table by name if it is not defined elsewhere like when I populate a datatable using sqldataadapter.


Is this the way it can be done? I believe this is the case, but can't find any definitive examples online (probably not searching properly)

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VS 2010 Check Whether A DataTable Is Populated?

May 15, 2012

i defined a list of DataTables

Dim PreSubTables As New List(Of DataTable)()

Then I parse some source files and depending on the data, possibly none of the tables in the list PreSubTables2 might be populated, so it's just an empty list. Later on when i refer to the first table in the list , I get "index out of range error"

If (PreSubTables(0).Rows.Count > 0) Then ...
' just dealing with the first table: PreSubtables(0)
For ii = 0 To (PreSubTables(0).Rows.Count - 1)


I'm just trying to come up with a line that checks whether the(at least the first)Table in the list is populated, before I can print it out or do other things.

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Export Datatable - Access Table Just Isn't Being Populated?

Apr 16, 2010

I'm having some trouble trying to export a datatable to Access. I've built an Access DB and Table identical to the datatable that I'm trying to export using ADOX.Now using and OLEDB connection I'm trying to populate that table. The following code works just fine in another app written in 2005 but not in 2008 for some reason.

Basically I'm bringing in the empty Access table into a dataset.Filling that table with the rows from the export datatable.Then running the dataadapter's update method to send the data to Access.The problem is the da_a.Update doesn't seem to work. No errors, the Access table just isn't being populated. I checked my before and after counts. I know that the datatable is being populated. It's just not landing in Access.

Dim conn_a As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & strFullFileName)
'Select Access Table into new Dataset[code]....

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VS 2008 Multiple Datagridview Populated From Same Datatable?

Jan 28, 2011

VB2008 & mysql
Is it possible?
If so how?

Wanting to have multiple datagridviews showing unique information (via filters?) based on cell content all coming from one data table.

3 datagridviews accessing the same datatable that has a [Job Status] column limited to one of the following 3 entries NEW, JOBS IN PROGRESS or COMPLETED and having that column hidden from view on all gridviews

Top grid showing only NEW jobs

Middle grid showing only JOBS IN PROGRESS

Bottom grid showing only COMPLETED jobs

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Forms :: Combobox Populated By A DataTable - SelectedIndex Property Will Not Set Either By Integer Or By FindString?

Feb 16, 2010

In a combobox populated by a DataTable I am having two issues!The SelectedIndex property will not set 1. Either by integer 2. Or by FindString


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.Net Assign Values To Datatable?

May 22, 2012

I have the String and integers to which some values are assigned. now i need to read the string and integer values and assigned them to the datatable which i have created using VB.Net.


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Cannot 'empty' A DataTable And Corresponding Datagridview

Jun 22, 2009

I have a datatable dimensioned as new.I add the columns that I need (during the form's load) I have a datagridview as on object on my form and set the datatable as its source.The table is loaded with values and they display properly.The User closes the form and returns to the 'Main' form. At this point no problems, everything is working great. NOW...The user re-opens the form containing the datagridview It has the values from the previous time it was open, plus the new values ! I have tried several things so when the user goes back into the form it only has the new values, but it always keeps the previous values and appends the new values to it. I have attempted to clear it by adding a line: datatable.rows.clear(); I have activily gone through the datagridview one row at a time and use a statement to clear the cells;

For Each DGVRow As DataGridViewRow In Me.DataGridViewErrorList.Rows

so far no luck.

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Assign Several Field Values In A Datatable Into A Single Text Box?

Jul 9, 2009

I have this working for a single field in a text but im trying to add more than one fields data .[code]...

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Add Columns To Datatable?

Nov 26, 2010

i have a datagridview table ("Bookingen") that is bound to an acces datatable

this table ("Bookingen") has columns

an i also have another form that alows people to add info like a registerform

what i would like is that when adding the info by button click

a column with the name of the person from registerform displayes in datagridview ("booking")

this my code so far

Public Class nieuw_personeel_invoer_code_
Private stroledb As String = "SELECT* FROM Loginnummer"
Private strconnection As String = "provider= Microsoft.ACE.OLEDB.12.0; Data Source=D:clifs project21.accdb; persist security Info=false;"


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C# - Sum Columns In A DataTable?

Apr 8, 2011

How can I get a sum for all the columns in a datatable? Say I had the following table. How can I calculate the "total" row? It should be easy to add total row to a datatable.

Columns hits uniques sigups, etc...
1 12 1 23
2 1 0 5


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Adding Columns To DataTable?

Jun 2, 2011

I have a DataTable oDT. oDT is populated from SQL Server with 6 columns including a column "bAAA" of varbinary(200) I have a function fx(ByVal byteArray As Byte()) as String I would like to add a calculated column to oDT something like this:

oDT.Columns.Add("sAAA", GetType(String), fx(bAAA))
'bAAA is not declared
oDT.Columns.Add("sAAA", GetType(String), fx("bAAA".ToArray))


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Array From 2 Datatable Columns?

Sep 28, 2011

Since now, I have the following:

Dim x = ( _
(From row In _Obj_DataSet.Tables(TableName).Rows() _


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How To Fill DataTable With 11 Columns And 1 Row

Dec 30, 2011

I fill a data table with 11 columns and 1 row.
Columns/ User Pass
Row / **User2054** 1234
I have a Label named lblUser and I want to put the value=User2054 from my Table(Collumn[0], Rows[0]). How I can fill it?

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How To Sort By Columns In A Datatable

Sep 1, 2011

I currently have a datagridview that is built from a datatable So lets say we have 6 columns


So the users will select there data from another program and paste into the the table. So lets assume that the data that is pasted is; (the column names are automatically put in)

123 456 789 101 112 134

So the table will now look like following (I remove the first row because its the same as the column name)

123 456 789 101 112 134

My problem is that the users can rearrange thier tables(column index) so lets say user A has the table in this format

123 456 101 112 789 134

So when they paste into the program, it will look like

123 456 101 112 789 134

So now "C" "D" "E" are incorrect and i need to swap those columns to be the same as the column name. I'm not sure how to attack this problem.My thoughts were to paste the data as is, than see what the first row in each column if it equals "A" assign it an index 0

B 1
C 2

This seems theres too many steps and will slow down the app...

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Ordering A Datatable According To Two Columns

Jun 10, 2011

I have a Datatable- table1 and i want to sort/order this datatable in ascending order depending on 2 columns-column0,column1 of table1. how can i do that?

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Ordering A Datatable According To Two Columns?

Aug 9, 2011

I have a Datatable- table1 and i want to sort/order this datatable in ascending order depending on 2 columns-column0 ,column1 of can i do that?

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.net - How To Merge Two Columns Which Are Already Exist In One Datatable

Apr 5, 2012

I have one datatable. In that table I have columns named [Total Day], [Present day], and [leave].
Data are as follows:

[Total Day], [Present day], [leave]
30 25 5
30 26 4

Now i want to concatenate those three columns in one another column. I want output something like this:

[Total Day] [Present Day] [Leave] [TotalDay PresentDay Leave]
30 25 5 30 VBCrLf 25 VBCrLf 5
30 26 4 30 VBCrLf 26 VBCrLf 4

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Add Four Columns From Datatable To List View

Oct 6, 2011

I have list of columns in DataTable to be added in list view. I have specified to the listview of columns in the order to appear and Datas as well.[code]

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Any Way To Display DataTable Columns In DataGridView?

Jan 27, 2011

Is there a way to add columns in a datatable to the intellisense of the datatable? Is there a way to display the columns of a datatable in a datagridview?

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C# - Export A DataTable To Xml With ALL Columns As Attributes?

Apr 19, 2012

Question: I'm exporting a System.Data.DataTable to XML.So far it works fine.But I want to have all the data in attributes, which works fine as well.But my problem now, if in one column, all rows are NULL, no empty attributes are written.So if I read the XML back to a DataTable, it lacks this column...How can I force write all columns even when they are empty ?(DataType not necessarely string)

public void ExportTable(string strDirectory, DataTable dtt)
using (System.Data.DataSet ds = new System.Data.DataSet()) {[code].....

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Change DataType Of Datatable Columns?

Sep 7, 2011

I want to change the DataType of all columns of DataTable. I don't want use the loop.. [URL]

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Copy Selected Columns From One DataTable To Another?

Mar 1, 2011

I have a scenario where-in I have a DataTable with certain columns "Col1, Col2, Col3". I want to copy just "Col2, Col3" into another DataTable which has a primary key "ID". What is the best way to copy them. There are 5000+ records and performance is a key factor.I tried with Select, DefaultView.RowsFilter but no success. I know one option is to loop through all records an copy data one by one in second DataTable. But wanted to know a better way.

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Copying Specific Columns From One Datatable To Another

Nov 25, 2011

This doesn't seem like something that should be confusing or difficult, but I'm having a hard time finding the answer to this problem. I want to copy columns with their data, not rows, from one large DataTable to a smaller one.I have a DataTable with many columns of data (around 20), and a string array of the columns (4 ) that I want in the copied DataTable. Is there a reasonable way to accomplish this task?

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Datagrid With Columns Tha Have Different Datatable Rows?

Feb 9, 2010

i want to make a datagrid with 2 columns and many rows

the columns i want to have databinding with a datatable
i want the 1 row 1 column of datagrid have data from 1 row of datatable
i want the 1 row 2 column of datagrid have data from 2 row of datatable


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Displaying Selected Columns Of DataTable

Apr 16, 2010

I am creating a DB application using the DataSources Wizard to create a strongly typed DataSet. Let's say that I'm working with the Employees Table of the Northwind DB, and my code is like this:
Dim nWindDs As New NorthwindDataSet
Dim empDT As New NorthwindDataSet.EmployeesDataTable
Dim empTA As New EmployeesTableAdapterempTA.Fill(NorthwindDataSet.Employees)
'Fill the Datagridview:Datagridview1.DataSource = nWindDs.Employees

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GridView To DataTable / Skip Certain Columns

Jul 14, 2011

[code]How can I skip certain columns of the gridview? For example: Columns 1, 3 and 6.

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VS 2008 Totalling Columns In A Datatable

Jun 21, 2010

I have set up a series of loops to construct a series of tables dynamically using a cloned table. Each table represents the output for a particular year. These work fine and create the correct output. However, I want to put the total of a particular column in these tables into textboxs on my form.

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VS 2008 Types In Datatable Columns?

Feb 3, 2012

When adding a column to a datatable. I can specify a type as one of my overloads such as

dt.Columns.Add(New DataColumn("UID", Type.GetType("System.Int32")))Why can't I use

dt.Columns.Add("etwe", TypeOf(Integer)) when I thought integer is a type. Instead its telling me that integer is a type and can't be used as an expression.

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