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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[2005] Getting Specific Columns From A Datatable

Jan 26, 2009

Is it possible in to filter out certain columns from a datatable? If suppose a datatable dt1 has 3 columns and I want to have a new datatable dt2 with the values of only 1 column from dt1 then what is the best approach to do it? I know a rowfilter exists for dataview of a datatable but there is no column filter as such.

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Database - Find Average Of A Specific Number Of Rows/columns In Datatable And Store To Array?

Jun 21, 2012

I am trying to program a noise reduction algorithm that works with a set of datapoints in a VB.NET DataTable after being helped with my other question. Basically, I want to take two integers, a coordinate value (yCoord for example) and a threshold smoothing value (NoiseThresh), and take the average of the values in the range of (yCoord - NoiseThresh, yCoord + NoiseThresh) and store that number into an array. I'd repeat that process for each column (in this example) and end up with a one-dimensional array of average values. My questions are:

1) Did anything I just say make any sense ;), and

2) Can anyone help me with the code? I've got very little experience working with databases.

[Code]...

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VS 2008 Finding A Specific Row And Specific Columns In Data Base File (Access)?

Jul 24, 2011

I wonder if it is possible to find a specific row and specific columns in data base file (Access) . You see , I am using a DataGridView control to show only SOME of the columns (fields) of a table from an Access file . For example , lets say that in the DataGridView control I only show the following fields :Field1 , Field2 and Field3 .Now , when the user selects an entry in the DataGridView control , I want to insert the text from Field4 into a text box on the form .

The problem , however , is that I don't know how to get the specific row in the data base file and also I don't know how to get the text in column (field) Field4 of that row .One thing that might be important is that the index of the row in the data base file is not necessarily the same with the index of the current row in the DataGridView control . This is because in the DataGridView control the rows are order by the contents in the ID Field .ol .

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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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Copying Rows And Columns From One Datagridview To Another

Apr 23, 2012

I'd like to copy some rows of data from a data-bound datagridview to a different datagridview.I thought adding a row would just be like this: [code]The trouble is that, instead of copying all the data from the row and putting it in the correct cells in the other datagridview, it seems to be taking the whole row object and putting it in the first cell, so the first cell contains this: [code]And the other rows are empty. How do I make rows copy properly?

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Copying DataGridViewRow To A DataTable?

Apr 16, 2009

tblProductsBindingSource, tblProductsTableAdapter I have delete the tblBindingNavigator,also my DataSet consist of 2 Data Tables namely tblProducts and tblChosenProducts, at this time tblChosenProducts is empty but has all the same Table Style of tblProducts. So at Form Load every things is working fine , what I would like to do is when I click in a cell of dgProducts (the DataGridView on my Form) is to populate my second Data Table(tblChosenProducts) and update it to the database(Invent_14April),

ublic Sub DgProduct_CellClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DgProduct.CellClick

[code].....

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Original DataTable Object Has Columns Added When Variable Has Columns Added?

Oct 6, 2011

I have a datatable property called prpParametersTable in a class called clsBatch. I have a procedure that sets a datatable variable called dtP equal to prpParametersTable at the beginning of the procedure. I then add three new columns to dtP.Here is my problem. When I add the three new columns to dtP my original table prpParametersTable also gets those columns added to it, why? I only want to add the three columns to dtP and not prpParametersTable. How can I do that?

Private Function prvfnc_InsertBatchParameters(ByRef cnn As SqlConnection, ByRef trans As SqlTransaction) As String
' set new columns that have BatchID, Insert DateTime, and UserID for the SQLBulkCopy method below
Dim clm As DataColumn
Dim dtP As DataTable = clsBatch.prpParametersTable

[code]....

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Copying Specific Lines From A Text File?

Feb 8, 2012

I have 2 text files that are formatted in standard XML One of them contains some lines that need to be copied to the other. What i am trying to do is search through the first file until i see the string "<Segment" then copy all lines into a rich text box up until the string "<segment/>" I Then want to look through the other file until i find the string "<Jointfree/>" then copy the contents of the rich text box to underneath the Jointfree String I Also need to search the second file until i find the string "<Markers/>" and then paste some text into the line above the markers tag.

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Forms :: Copying And Pasting From Specific Places?

Feb 10, 2011

I am trying to copy text from a standard rich text box on a button click. However, I only want the first 3575 characters to be copied to my second rich text box, and after the 3575 I want a further 8482 characters to be copied to my third.

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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;"

[Code].....

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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...
Rows
1 12 1 23
2 1 0 5

[Code].....

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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))

[Code].....

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Array From 2 Datatable Columns?

Sep 28, 2011

Since now, I have the following:

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

[code]....

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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

A B C D E G

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)

A B C D E G
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)

A B C D E G
A B C D E G
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

A B D E C G
123 456 101 112 789 134

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

A B C D E G
A B D E C G
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 equals.so 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 table1.how 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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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

[code].....

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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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VS 2010 Iterating Through Datatable Columns

Dec 2, 2011

I am wondering if it is possible to iterate using columns of datatable.

I have tried something like this:

Dim myCol As New DataColumn
Dim myRow As DataRow = Nothing
Dim myCell As New DataGridCell

[Code]....

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