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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Output A Single Column From A Datatable?

Sep 24, 2010

So this doesn't seem like it should be that difficult, but apparently I'm overlooking something..? I have a datatable that has 4 columns. I want to output only the second column from the datatable. Here's what I've got so far:

Dim dt As New DataTable
** Datatable is set here **
Dim row As DataRow[code]....

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Convert Single Instance Program To Network "Multi-Seat" Program

Apr 26, 2012

I have developed some programs for processing and issue-coding electronic documents. I am teaching myself how to work with SQL Server because I want these programs to work with electronic documents imported into SQL Server as opposed to messing around in a folder stuck on the desktop, for example. From there I want to expand on the program so that it is a network enabled program.


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Querying A Single Column And Displaying All Results In A Single Textbox?

Sep 5, 2010

I am trying to make a list, separated by a comma, of entries from a single column in a SQL database. I have been spending the last several days searching for a way to do this, but every thing I found either didn't work, or wasn't exactly what I was looking for.

The query will pull all the email address that are not null. What I need to know is how to take the result of that query and make it look like this:,,, etc, etc, ...

I feel like I should know this, but for the life of me, I can't remember nor can I find it in any of the textbooks I have.

I am using Visual Basic 2010 and SQL Server 2005. I also have access to Visual Basic 2005 if needed.

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Have A Datatable Which Has 5 Column : Copy Only Its 2 Column In And Save It Into New Datatable?

Mar 15, 2009

I have a datatable which has 5 column. It is possible to copy only its 2 column in and save it into new datatable.I used this code but it copies all the 5 column

Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _
Select obj).CopyToDataTable
i used this one but it is not supported

Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _
Select obj.item("Column1"), obj.item("Column2")).CopyToDataTable

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.net - Updates To A Single Datatable Row?

Jun 16, 2011

Why does the first method below work? I would have thought that the variable 'row' is completely separate from anything else, such as a row in DataTable1. Also, is there a drawback to using the first method? For changes to lots of columns in a single row, I'd rather do it that way.


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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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Retrieving Single Element From Datatable

Sep 11, 2009

I have a string array (values) whose elements look like this
and so on....

and a datatable that contains all the valid ids (the 1xxx numbers) and their corresponding names. I need to check whether or not the table contains the id and if it does i need to get its name.

This is my current code

Dim tbl as DataTable = GetTable("Select ......")
tbl.PrimaryKey = New DataColumn() {tbl.Columns("sensor_id")
For each value as string in values


but it seems like it is a round about way since I already know the element exists in the table and the select statement returns an array which i dont need because I know there will only be one datarow associated with this id. I feel like there should be an easier or actually more efficient way of doing this. If not oh well but I had to check anyway.

but this returns an array of datarows when i know I am only going to get one datarow from this query

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.net - Remove Single Quotes From All Cells In A DataTable?

Apr 2, 2009

I have a table with many values inside of it that might have single quotes around them. I need to create a duplicate table without those single quotes. I can't modify the original table as I need to use it, 'as-is' later.

I've done this with a table.Clone and using a foreach to loop through the rows and columns removing single quotes as I need and then putting that new row into the new table. It works and it's straight forward.....but

I'd like to do the same thing using LINQ. This was my attempt....

Dim myResults = From myRow In dtTable _
From myItem In myRow.ItemArray _
Where TypeOf myItem Is String AndAlso _
myItem.ToString.StartsWith("'"c) AndAlso _

I had trouble finding examples that weren't looking at a specific column in the DataRow. It looks like my code does pull back all the matching results - but I'm at a lose for how I can create a duplicate table/modify the values?

The only requirement is to not using a For Each; as I already know how to do that. I've gotten closer - but I still can't seem to create a new row or a new table.

My new approach hits a dead-end when I try to do this:

Dim MyNewRow As New Data.DataRow With {.ItemArray = myRemovedQuotes.ToArray}

The Error message I get says, "Error 1'System.Data.DataRow.Protected Friend Sub New(builder As System.Data.DataRowBuilder)' is not accessible in this context because it is 'Protected Friend'."

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VS 2010 Switching DataViews For A Single DataTable?

Jan 13, 2011

I have a data table a simplified version of which is represented below:

Number | Group | Date | Client | Amount
1 | 220 | 28/12 | Company A | 0.345
2 | 220 | 29/12 | Company B | 0.451
3 | 240 | 26/12 | Company A | 0.510
4 | 240 | 27/12 | Company A | 0.510
5 | 220 | 30/12 | Company C | 0.151

I have a default view which represents the whole table.

But I need also a different view which represents the summary of the same data.

Code | Amount
220 | 0.947
240 | 1.02

In other words, I need grouped totals.

The question is - is it possible to accomplish by preparing a dataview for the datatable and assign it to the .DefaultView property (I need a user to be able to switch between detailed and summary views). Normally I always prepare views in a database but now I need to do it with DataTable and I simply have no experience of working with DataView class.

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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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DataTable.Select With ' (single Quote) Character In The Query?

Oct 19, 2011

I have a string like "Hello'World" and a Data Table with some records in it. One of those records is "Hello'World".he problem is, when I do a .Select in the Data Table, it only tries to search for the "Hello" part and throws an error on "World" because it interprets the ' (single. cuote) like the closing cuote on"text = 'Hello'World'")I have gone through msdn doc, and it says I can escape some characters with [] brackets or f.slashes , but I just can't figure out: .select("text = 'Hello[']world'")

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Referencing A Column From Another Column In Datatable?

Feb 5, 2012

I have a data table, i want to add a new column on that table, the data in that new column will depend in the data from another column. Now i can think of two ways to accomplish this, first is loop through the whole table and do the statements to get my new columns appropriate data. the second approach would be to give the new column an expression, then convert the table to xml (to remove the expression) then convert the xml string back to datatable.

Now, is there any other way around this? what could be the most optimized way in solving this task?

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Make Boolean Column Editable ( VB GridView Filled By DataTable That Has Boolean Column) ?

Oct 27, 2011

After Filling a DataTable in GridView's DataSource . A column with check box Type appears but it created as read only column and I can't enable it or make it editable... even i tried .readonly = false and still can't be edited

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.net - Convert A Single Into 8 Bytes?

Jan 6, 2010

I have a single that might have a decimal place but might not. I have to put the digit before the decimal into the first 4 bytes and the digit after in the next 4 bytes.

So 1.1 would be 01-00-00-00-01-00-00-00
or 2.1 would be 02-00-00-00-01-00-00-00
or 1 would be 01-00-00-00-00-00-00-00

The digit before the decimal point is stored like an integer in bytes the same with the digit after the point. So 1.1 gets split into 1 and 1 and then stored as 2 DWORDS: 01000000 and 01000000

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C# - Convert MBF Single And Double To IEEE?

Jun 4, 2010

Follow-Up available: There's a follow-up with further details, see Convert MBF to IEEE.

I've got some legacy data which is still in use, reading the binary files is not the problem, the number format is. All floating point numbers are saved in MBF format (Single and Double). I've found a topic about that on the MSDN boards but that one only deals with Single values. I'd also would like to stay away from API-Calls as far as I can.

Edit: Just in case somebody needs it, here is the VB.NET Code (it's Option Strict compliant) I ended up with (feel free to convert it to C# and edit it in):

''' <summary>Converts a MBF Single to an IEEE Single</summary>
''' <param name="src">The MBF Single value</param>
''' <returns>The converted IEEE Single value</returns>


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Convert Single Byte To String?

Feb 26, 2012

i would like to convert a single byte to a string.

dim mybyte as byte = &h11
dim mystring as string
i tried


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Excel - Convert Single Sheet In XLS To PDF Using .NET?

Jul 6, 2011

I have working code that will convert an xls to pdf, however, the code converts the whole workbook and I really just need to select a single sheet out of the workbook, but I can't figure out how to do it.The code I currently use is:

Dim fileName As String = "filepathfilename"
Dim xlsApp = New Microsoft.Office.Interop.Excel.Application
xlsApp.ScreenUpdating = False


Where in the code do I need to specify the sheet in the workbook? Note that I will need to make it so that depending on an option fed into the app, the sheet will change, though I don't think that should make a difference, but I thought I'd mention it either way.

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Binding A Single Column To A DataGridView?

Nov 24, 2009

In previous versions (VB.NET 2003) I would do

datagrid.datasource = dataset.tables(0)
datagrid.datamember = "Column1" 'Where this is the name of the column

This would show me just that column in the grid regardless of the number of columns in the dataset.

In VB.NET 2008 I do: datagridview1.datasource = dataset.tables(0)

I see all the columns.I then add:

datagridview1.datamember = "Column1" 'Where Column1 is the column name

I then have an empty grid.How does one get only a single column to show in the grid from a multi-column data source? I am using internal code to populate the datasets and tables.

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Update All The Rows In A Single Column?

Aug 20, 2009

I can't seem to figure out how to update a single column for every row in my database...

Dim cmd As OleDbCommand
cmd.Connection = con


What I'm looking to do is to update add a value to the given value already in the row. for instance:

id name value
1 peter 8
2 paul 10
3 mary 16.25

I just want to add a specific value to each row, such as "8"

id name value
1 peter 16
2 paul 18
3 mary 24.25

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Updating A Record - Single Column ?

Nov 14, 2009

I have problem trying to update a single column. I initially insert an null value,

Here is the insert code..


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Convert Script For Compiling Into Single .EXE File

Jan 20, 2011

I have a vbscript which I would like to compile into a single .EXE file. It's my understanding that you can't do this with vbscript and that the available applications which supposedly do the conversion are actually just glorified self extracting zip files which dump the vbs to a temp folder and run the script - not what I want.I've no experience in VB.Net and very little in VBS so I'd appreciate it someone could look over the script and let me know what areas I need to change so I can investigate the correct syntax in VB.Net.what the script does just in case there might be an issue from the conversion. The script does several things in this order:starts by scanning a CSV file (which contains a list of peoples usernames, their department and full name) looking for the line that contains a username match to that of logged in users's logon name via expanding the environment variable %USERNAME%..Once found, it splits the entire row into an array..Sets a series of Environment variables at Process level using contents of the array as values..Does a basic time check and sets the result as environment variable as above..Checks to see which version of CAD application is installed on users machine and starts application with command switch to process configuration file during startup..I don't think its overly complex now that I understand the VBS code but in VB.Net, I don't know what lines will work and what won't. I've not installed Visual Studio Express yet but will do so shortly - I presume this program is suitable for converting my script? [code]

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VS 2010 Convert String To Single (Fontsize)?

Jan 28, 2011

I have a combobox which I want to use to change the font-size of text, but I'm getting an error. Dim xfont As New Font(font_cbo.Text, font_cbo_size.Text, FontStyle.Regular, GraphicsUnit.Point)

Conversion to Type Single is invalid So I tried to convert the string to Single, but with the same error. If I replace the "font_cbo_size.Text" to a number, it'll work fine.

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Format Datagridview Single Column To Currency?

Sep 1, 2007

how to make a single column of a datagridview into currency format?

InventoryDataGridView.Columns(5).Name = "inventory_cost"
InventoryDataGridView.Columns(5).DataPropertyName = "inventory_cost"
InventoryDataGridView.Columns(5).Width = 70
InventoryDataGridView.Columns(5).HeaderText = "Cost"

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Format Sql To Allow Multiple Rows In A Single Column?

Oct 11, 2011

i have a project and i want to insert multiple rows into a single column and then display them into a single text box...

this is what I'm going for:

DATABASE: column 1
| column 2 | column 3
| column 4 |


yes i know I've posted this in 3 different forums but no one seems to know either

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How To Format Datagridview Single Column To Date

Oct 1, 2011

I am filling datagridview with data from SQL server 2008 R2. one column is date which is stored in the data base as yyyy-mm-dd and when i retrieve it displays in the same format. I want to change the display to dd-MMM-yyyy.



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Set A Single ComboBoxCell In A TextBoxCell Column Of DataGridView?

Jun 21, 2010

I have a DataGridView with two columns defined like:

Dim col As New DataGridViewColumn
col.DefaultCellStyle.BackColor = Color.FromArgb(&HFF)
col.Name = "Description"


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Add A Column In DataTable Say, Dt = New DataTable()?

Dec 30, 2010

I have a string say, str = "system.Int16" I want to add a column in DataTable say, dt = new DataTable()I want DataType for that column as per 'str', i.e. System.Int16 Then How to? dt.Columns.Add("MyColumn", ...)

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Convert Text With Single Quote To Upload To Oralce DB?

May 14, 2012

I have a function in VB.NET that runs a query from an MS SQL DB, puts the results into temporary variables, then updates an Oracle DB. My question is, if the string in the MS SQL contains a single quote ( ' ), how do I update the Oracle DB for something that has that single quote?

For example: Jim's request Will produce the following error: ORA-01756: quoted string not properly terminated The ueio_tmpALM_Comments (coming from MS SQL) is the culprit that may or may not contain the single quote.

update_oracle =
"update Schema.Table set ISSUE_ADDED_TO_ALM = '1'," & _
"ISSUE_COMMENTS = '" & ueio_tmpALM_Comments & "'," & _
"where ISSUE_SUMMARY = '" & ueio_tmpALM_Summary & "' "
Dim or_cmd_2 = New NetOracle.OracleCommand(update_oracle, OracleConn)

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Object / Array Reading (Row Or Column) Into Single Variable?

Apr 9, 2009

I have a variable defined as Object(,) that was read in from excel. Without getting into a for/next, is there a simple way to read the c-th column or r-th rown from that array into a single variable?

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