DataTable.GetChanges After DataTable.Merge?

Apr 28, 2009

Not certain what exactly I am doing wrong here, but I am having problems in setting a new DataTable (for posting back to the database) to the Changes resulting from the Merge proc of 2 DataTables. The code works fine until I attempt to set the ChangesTable --- it always ends up = Nothing.What is strange is that the "preMergeCount" = 0 and the "postMergeCount" = 23, which is EXACTLY how I expect it to be! So I know that the Merge is working correctly.

Dim sqlTable As DataTable = dsMonitoring.Tables("SQL_SRTraps")
Dim exlTable As DataTable = dsMonitoring.Tables("Excel_SRTraps")
AddHandler sqlTable.RowChanged, AddressOf Row_Changed


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Save All Changes On DB If DataTable.GetChanges() Don't Have Last Changes?

Feb 16, 2012

I work with windows forms and on the form I have a DataGridView. This gridView I fill with a DataTable dt. The dt I fill with OdbcDataAdapter. For save the changes I use adaper.Update(dt) on Event Handler gridView_RowLeave. The problem is that dt doesn't have last changes of gridView. For exemple if I modify some data in one row or add a new row with data when I leave that row the method dt.GetChages() return false and I must leave more that 1 row for dt.GetChanges() return true.


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Check Rowstate In GetChanges DataTable?

Mar 10, 2010

i getchanges from dataSet

when i am iterating through the rows I would like to check rowstate to see if row was added or modified. It says I cant check through an instance and the expression will be ignored..

Dim changes As New DataSet
changes = dsRates.GetChanges()
Dim count As Integer = 1


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DataTable.getChanges() Not Working As Intended?

Mar 13, 2010

I'm currently working on a VB .net project that requires connection to a MySQL table. I've no problems loading data from MySQL table to a datagridview. I'm hoping to allow users to make changes to the datagridview and save those changes back to the MySQL table. Below is the Sub I wrote to save the changes. Before saving, it will check if there were any changes made to the datatable. However, datatable.getchanges() does not seem to detect changes made to datagridview (and hence, datatable; I "bound" the datatable to datagridview by means of bindingsource).


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C# Equivalent Of The Code: DataTable.GetChanges(Not DataRowState.Deleted)?

Jan 23, 2011


DataTable.GetChanges(Not DataRowState.Deleted)

What is the equivalent in C#?

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How To Merge Two Datatable

May 19, 2012

I need to marge two datatable with condition. i table data come from local XML Database and another data come from remote sql data if any update made at remote datatable and then marge with local datatable. i wrote a code below :

Public Sub MargeTwoTable()
Dim SQL As String = ""
Dim RemoteTable As New DataTable
Dim LocalTable As DataTable


as you see in my code data come from remote database which update date getter then local database . Both table are same and "ID" is primary key. I code is working well. But problem is that when data more then 1000 updated record so this function take too long in loops.

i write a code like : Dim mm() As DataRow = LocalTable.Select("ID = '" & RemoteTable.Rows(i).Item("ID") & "'"). for finding local datatable id row so when data is more then 1000 it take too long because localtable record more than 100000 records. So I need someone help to modify my code what the best way to write the code.

View 3 Replies - Merge Rows In Datatable Which Had Same Value (VB)?

May 13, 2012

I have one datatable tempDT with value :


The problem is I want merge duplicate serial_no into one row which the value of testong adding to new column. I have tried many ways, but I can't find the solution. Here is my code behind :


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Datatable Merge And Getchange?

Apr 21, 2010

My code got an error at at messagebox said System.NullReferenceException was unhandled Message="Object reference not set to an instance of an object"What is wrong? (dt1 and dt2 are all ok. They are have only one columnd: ID)


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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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Datatable Update Using Merge Function

May 13, 2012

i create a Class to update data from remote sql server to local compact sql server data. I write two method one method check if any update date in remote server method like..[code]Last i Call SaveLocalDatabase method. But When i check table in my local compact sql server database there has no data any think missing to write. i Think i found a problem. i use LocalTable.Merge(dTable, True). When Merge Call then rowstate remain unchange.

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Merge Multiple Datacolumns In A Datatable?

Feb 2, 2012

I am trying to merge multiple datacolumns in a datatable. Eg. The address data is stored in a different columns such as, Housename, street, city and postcode. I want to merge those datacolumns in to one and put it into one datacolumn as "Address".

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Merge An Array [String()] With A DataTable Without Looping?

Apr 19, 2012

Is there a way of merging (importing or whatver is the correct terminology is) the data from an Array in to a DataTable woithout looping. I already know how to loop through the array to populate the DataTable with new DataRow but I'm looking for something much faster if it exists. I've got a 1 dimensional String array i.e. 'String()' that I need to populate a DataTable with new DataRows.

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VS 2008 DataTable.Merge(AnotherDataTable) - RowState Remains Unchanged?

May 25, 2009

I want to compare differences between two tables in my database with identical schemas.
Dim changedRows As DataTable = DataTable1.GetChanges
'changedRows is always Nothing. Why???

The DataTable1 is updated with rows from DataTable2 correctly. i.e. missing rows are added and datarows that don't match are updated. But the RowState of each row is still unchanged. I need to have the rowstate (added/modified/deleted) so that I can update the database table.

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C# - Save/merge Rows In DataTable To Database Without Depending On Row State Accuracy?

Jun 3, 2012

I need to write a method in C# to save all rows in a given datatable back to the database, but I cannot depend on the rowstate of each row. I can't think of how best to do this without extensive looping through the database table data or constant database querying.

I want to essentially perform the following insert / update for each row in the datatable, but more efficiently:


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Loop Datatable And Select Checkboxlist Item Based On The Datatable Field Values

Aug 18, 2011

I am trying to display value of the field ("UserID") for every row exists in datatable to checkboxlist(make the checkboxlist item selected).

I used for loop, but only the field value from last row of RoleUsers table is selected in the checkboxlist.

Here is my code

Private Sub DisplayRoleUser()
Dim conn As SqlConnection
Dim cmd As SqlCommand


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VS 2005 Datatable Vs Dataview - Apply A Filter To The Defaultview.rowfilter Property Of That Datatable

Mar 15, 2010

I have a datatable and I apply a filter to the defaultview.rowfilter property of that datatable. If I then loop through the rows collection of the datatable, will I only be able to see those rows that the filter applies to, or will it loop through all the rows?

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VS 2010 : System.ArgumentException Was Unhandled Message=DataTable 'get_item_list' Does Not Match To Any DataTable In Source

Apr 21, 2010

I am working on a project that takes an xml schema and xml data files and places them into a DataTable, the 2 files are generated from a working table that i have written to disk. I wish to load these 2 files into a DataTable. Here is What i have
Friend Function CreateTable(ByVal tableName As String) As Boolean
Dim table As New DataTable(tableName)
table.ReadXmlSchema(tableName & ".xsd")


this however produces the following error on line 3


System.ArgumentException was unhandled Message=DataTable 'get_item_list' does not match to any DataTable in source.

get_item_list is the parameter passed into this function (tableName)

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Datagridview Bound To A Datatable Setting Its Datasource Property To The Datatable

May 20, 2011

I have a datagridview bound to a datatable setting its datasource property to the datatable. I would like to have a child form that contains a list of columns associated with the datatable that contains a checkbox that will allow the user to hide and show the columns ( I do not know the best control to use here) (I assume this is the easy part as All i need to do is loop through each of the datatable's columns to get the column name)

now I would like save these visible columns on some event like form_closing so that the next time the user opens the form up it will remember the settings

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Get Subset DataTable From Main DataTable, But Preserve Primary Key & RowErrors?

Apr 16, 2012

I came across a problem with using a BindingSource as my DataGridViews.DataSource. Whenever I applied a filter to a column in the BindingSource and the user makes changes that don't match the column filter the DataGridViewRows would automatically disappear. A similar thing would happen when applying a Sort to a column. If the user made any changes the DridGirdViewRows would automatically sort causing rows to be moved around. This was not ideal for my application and there isn't anyway to stop this from happening with the BindingSource.

To correct this issue I have to use subsets of data. I use a DataView to apply the filter and sort to the main DataTable, which creates the subset DataTable.The problem is when I use the DataView.ToTable method I loose the Primary Key and RowError information. So I have to reapply this information everytime the user filters or sorts the DataGridView.Is there a better way to get a subset DataTable?[code]...

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VS 2010 Datatable - Summarize Multiple Occurrences Of An Item In A Datatable

Jun 5, 2012

I have a datatable that has a resource in one field and hours used in another, it looks like this -

Resource Hours Used
Manager 1
Accountant 1
Field Staff 2
Accountant 3
Manager 4
Manager 1
Administrator 6
Field Staff 4
Manager 0.5
Administrator 1

What I want to do is be able to create a summary of the data table above that groups multiple occurrences of a resource and adds up the hours used for that resource, creating a summary that looks like this -

Resource Hours Used
Manager 6.5
Accountant 4
Field Staff 6
Administrator 7

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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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Creating DataTable And Copy Existing DataTable Schema?

Feb 17, 2011

I'm using 2010.I have a DataSet with a Table and data. MyDataSet1 which contains Table1 I want to create another table that is the same as the Table1 but without data, but it should have the columns, etc.

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Getting Array Of Selected Datarows From A Into A Datatable?

Apr 8, 2009

I am getting array of selected datarows from a use the commands below to get that array or datarows

Dim foundRows() As DataRow
strExpression =

Here is what I tried.I have looked at examples by MS but they all just write to the screen and I have no interest in that.

For Each rowWork In foundRows

"LineOfBusiness = 'CPP'"

foundRows = modXchange.pdtWork.Select(strExpression)

Now, I want to place the rows from foundrows into an empty data table.I did what I thought was the obvious but that only returns a bunch of rows with no data

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Loading The Contents Of DataTable Adapter Query Into A Datatable?

Nov 18, 2009

load the contents of a query from a dataTable Adapter into a datatable?

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Tableadapter.fill(datatable) Fills The Row That Was Not Added To The Datatable

Aug 6, 2010

I am trying to add NewRow to the database by using datatable in dataset, but before I do that I want to make sure that row is not already there. I create new row for the datatable I am working with, fill it with information. I fill datatable with the row from database that has the same primary key as my NewRow by using tableadapter.fill method, but when I do that my NewRow that was never added to the datatable is filled with information from database(and not information that I assigned to it). I count rows in my datatable before I fill it and it's 0, so why is my NewRow affected by Fill command? (I am using VB.NET 2005 Framework 2.0)


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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


View 1 Replies - Copy Data From Datatable To Dataset.datatable?

Oct 31, 2010

how to copy data from datatable to table in dataset i ry this but its readonly property


View 1 Replies - Looping Through Records From One DataTable And Populating Another DataTable In .net

Aug 10, 2011

I have an application where I have a datatable ("DataTableA") that returns just one column ("ProductID").

I want to read each row of "ProductID", process some business logic, then copy both those columns (ProductID & ProductIDBusinessLogicValue) to DataTableB. This DataTableB is then displayed on the page.

What would bhe the best way to read each row of DataTableA ?

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Use A Datatable As A Data Source To Update A Second Datatable Using Sql?

Aug 10, 2011

I am updating a data table (dt_report_crypt) from an encrypted csv file in the code below:I decrypt the colums and update the same dreport_crypt, such that it will contain de-crypted data.This part is working wellI however need to use this de-crypted datatable as a data source to update a second table(dt_report), using the sql SELECT command to filter relevant data,

Dim dt_report As DataTable
Dim dt_report_crypt As DataTable
Using cn As


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VS 02/03 Datatable - Select Statement And It Will Go To A Datatable Object

Apr 4, 2011

I have a select statement and it will go to a datatable object, I would like to do the following

textbox1.text=datatable(first field value)
textbox2.text=datatable(second field value)
textbox3.text=datatable(third field value)

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