Asp.net - Adding A DataColumn To A DataTable?

Nov 22, 2010

How do I go about adding a ButtonColumn to a DataTable.

I am basically using a DataTable as the DataSource of a DataGrid and need to add a ButtonColumn to the DataTable so that when I DataBind it to the DataGrid it all works.

Although when I try

dt.Columns.Add(buttonColumn)

This is not allowed. It has to be a basic DataColumn.

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VS 2005 - Adding DateTime DataColumn To DataTable?

Jun 16, 2010

I'm adding a DateTime DataColumn to a DataTable like this:
Dim colDate As DataColumn = New DataColumn("Date")
colDate.DataType = System.Type.GetType("System.DateTime")
dt.Columns.Add(colDate)
Then when I try to add it to my datatable, if the value is Nothing I get an error saying string was not recognized as a valid DateTime. I'm having trouble getting this to work.

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VS 2005 Shifting The Position Of A Datacolumn In A Datatable?

May 21, 2009

Can anyone demonstrate with an example how to shift the position of a datacolumn in a specific position after it is added at the end of a datatable.For example lets say I have a datatable with 9 columns and 5 rows. Now I added a 10th column. However I need this new column as the 5th column which requires shifting. How do I perform this shifting?

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Show Rich Text In A Cell Of A Datacolumn Of A Datatable?

Jan 14, 2010

I am currently working with a datatable and I want to be able to show richtext in a column of the table. First question can this be done? I can force the column to be Type Of richtext box. However, when I try to view/display the table, I get something like..."System.Windows.Forms.RichTextbox, Text: Text That I have added" in the column.

Is there a way that I can get it to show the rich text in a cell of a datacolumn of a datatable?

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Storing String Item In A Date / Time DataColumn Of A DataTable

May 27, 2009

I have a datatable which loads data from an Excel Spreadsheet. One of the columns in the Excel SpreadSheet was of type "Date/Time" in which date values are stored. Now I appended the datatable with three new rows and I wanted to store string values in these rows using the code below. However due to the fact that one of the columns are date/time type, an error is generated as date/time column does not accept string value. I have two questions

a. Is it possible to store string value in date/time DataColumn?

b. Is there a remedy to this situation? [code]

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Adding A Datatable And A Session Containing Datatable?

Feb 3, 2010

I have a session which contains a datatable and also have a function which returns a datatable. I need to add these two. How can I do this? The below code is to be replaced with correct code.

Session("Table")=Session("Table")+obj.GetCustomer() where obj is an object of the business layer.

The '+' sign cannot be used to add these two, so how can I do this?

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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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Adding Data Into DataTable?

Jul 15, 2010

i have a problem when add data into dataTable. The problem is that after populating the dataTable with the 1st, and when adding a 2nd column, the row that contain the data is not at 1st row of 2nd column. It is directly under 1st column row. For example, column 1 has 10 rows of data. After adding the 2nd column, the data is at row 11 instead on the 1st row. Can someone tell me how to add the data for 2nd column so that it will be in the 1st row. Code for adding the data

Dim col1 As DataColumn
Dim row1 As DataRow
col1 = New DataColumn("Column 2", System.Type.GetType(" System.String"))
dTable.Columns.Add(col1)

[code]...

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Adding Datarow In Datatable?

Mar 15, 2012

I've VB.NET function that reads data from an Excel sheet and adds rows in a Datatable.

Private Function LoadDataToRows(ByVal TableName As DataTable, ByVal Header As System.Collections.Specialized.StringCollection) As Boolean
Dim HeaderDataExcel As String = String.Empty 'Data Header

[Code].....

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2008 - Adding A Datarow To A Datatable

Nov 4, 2009

See the code below which is triggered on a datagridview row validation event where the datagridview datasource is a datatable.

The messagebox shows that it loops around as expected populating the datarow with the expected values (NOTE: There are no primary keys as this is a college assignment with specific requirement and all fields can be nullable).

I had to use ImportRows as AddRows would always error due to "This row belongs to another table" the odd thing was the values were different and again the table contains no primary keys.

The code below runs but never adds a datarow to the dataset datatable "Bookings", does anyone know what the problem might be?

CODE:

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Adding A Datatable To A Database Programmatically .NET?

Oct 31, 2010

I am trying to add a datatable to a database. Here's what I've been trying:

Dim newDataTable As DataTable = New DataTable("Example")
VocabularyDataSet.Tables.Add(newDataTable)
SqlDataAdapter1.Fill(VocabularyDataSet.Tables("Example"))

I've tried various incarnations of Fill and Update. But the tables will not save on the database!

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VS 2010 Adding ArrayItems To Datatable?

Jul 20, 2010

I have an array which holds the following items

for example

Quote:

myArray(0) = (1)
myArray(1) = (4,2)
myArray(2) = (10,15,20)

[Code]....

and then am trying to add other column based on items available in myArray().

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C# - Adding A Way To Preserve A Comma In A CSV To DataTable Function?

May 17, 2010

I have a function that converts a .csv file to a datatable. One of the columns I am converting is is a field of names that have a comma in them i.e. "Doe, John" when converting the function treats this as 2 seperate fields because of the comma. I need the datatable to hold this as one field Doe, John in the datatable.

Function CSV2DataTable(ByVal filename As String, ByVal sepChar As String) As DataTable
Dim reader As System.IO.StreamReader
Dim table As New DataTable
Dim colAdded As Boolean = False

[Code]...

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Exception Was Thrown When Adding New Rows To Datatable?

Aug 20, 2010

listA is list of integerdtListB is DataTableI'm checking that if StudentId of ListA doesn't exist in dtListB, then add it to the dtListB.

Dim stidListA, stIdListB As Integer
For Each la In listA
stidListA = la.StudentId

[code].....

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Parsing Error On Adding A Csv Text Value Into A DataTable In .net

Apr 19, 2011

I'm trying to add records from a CSV file into a dataTable in vb.net, as follows:

dim myObjAdapter as new myDataSourceAdapters.myTableAdapter
dim myObjTable as new myDataSource.myTable
myObjTable = myObjAdapter.Getdata

[Code]....

PS: in CSV file, the decimal digit is "." and if I add directly a record into table, using "." as decimal separators, the numbers get right format.

There is a kind of settings to change, or option to enable/disable on adding this records to do the right adding?

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VS 2010 Most Efficent Way Of Adding Rows To A Datatable?

Feb 28, 2012

I'm populating a datatable with this

Using con As New MySqlConnection(strCon)
'get users direct friends
Dim cmd As MySqlCommand = New MySqlCommand("SELECT distinct f.* FROM friends f WHERE (f.UserID = ?UserID) AND (f.FriendUserID <> ?FriendUserID)", con)
cmd.Parameters.AddWithValue("?UserID", UserID)

[Code]...

now I need to create another command, datatable and datareader in this same function and add the rows of that datatable to the one above. What is the most efficient way of doing this?

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When Adding A Checkbox To A Datagridview Datatable Get Dataerrors

Apr 8, 2011

I have a datagridview that I've added a checkbox column to. When I preview my data without the checkbox it works fine. when I run the program and try to load the datatable, I get a data error. I'm not sure what may be causing this. Where can I look to figure out what's causing this error?

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Adding Rows To A Datatable Based On Elements Of An Array

Feb 4, 2010

I have a data table in a loop that adds rows on each loop. During the loop i collect an array of unknown size. At the end of the loop i want to add a new row to the datatable with eachelement of the array as a field.[code]I could hard code this if i knew how many item would be in the array but i dont.Is there any way i can loop through the array and append the value to a row?

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VS 2008 Adding Values From Array To DataTable Rows?

May 21, 2011

I am trying to add the returned values from an array to the rows in a data table: Here is my current code the values load properly into the list box but not the table, each row ends up with the same value.

current code not working correctly
Dim dtrow As DataRow
Dim lat As Double = CDbl(34.213209)

[Code]....

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Setting SelectedIndex On A Combo After Adding A Row To Datatable Not Working Correct?

Dec 17, 2009

adding to the binding source then setting the combobox to selectedIndex of newly added row is not working.the new row is in there but it does not set the selectedIndex to the specified index. but if I run the code a second time it selects it.what can i do to make sure the combo uses the specified index?

Dim drv As DataRowView = CType(Dispatch.M8CustomersBindingSource.AddNew(), DataRowView)
drv("custID") = "999999"
drv("CustomerName") = "Select Customer"

[code].....

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Possible To Have A DataColumn With Space In Name?

Feb 17, 2011

I have a DataTable that I am creating and binding to a GridView. Currently the headers do not have any spaces and it makes it hard to read. I want to space them out but I'm having a minor issue.[code]I know that I can set the HeaderText in the columns declaration like below, but I won't know how any columns I am going to have. And would rather the columns be generated automatically. [code]

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VS 2005 Can Not Bind To DataColumn

Feb 5, 2011

Anyone have any ideas what would prevent my data from not be ing able to be bound to my data column? [code]My error says cant bind to column named SellingPrice? I have many other columns ALL binding the same way and other parts of my program recognize SellingPrice ?

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Change When An Expression In A Datacolumn Is Evaluated?

May 28, 2012

Is there a way to change when an expression in a datacolumn is evaluated?

I'm trying to make a simple total function which sums the values of a particular column in a data grid. Normally the expression is evaluated when I leave from the datagridview, but I wish it to be evaluated when the row is changed.

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Default Value Of String.Byte[] Datacolumn

Aug 13, 2010

in my datatable I've a String.Byte[] column which contains the array of bytes of an image. So, when the datatable is binded to the datagrid, I can see the picture, if present, and the red cross if is not presente. So I can remove the red cross, by assign a value to the DefaultValue property of the datacolumn. But what default value I've to assign?? I tried with system.dbnull.value but the red cross is still present.

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VS 2008 Comparing An Array With The DataColumn?

Dec 28, 2009

First of all - It`s my first post here so welcome I have a short question.I have an array with strings values, and a datacolumn with values of the same data type. The question is - what is the most efficient method to find values which are in the array, but aren`t in the datacolumn?

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.net - Get An Specific Row Or Cell Value From A DataColumn Object With No Using A DataGrid?

Aug 20, 2009

This is the code I have:

Sub Main()
Dim dts As New DataSet
Dim da As New SqlDataAdapter
Dim SolTabla As New DataTable

[code]....

For example, I want to access the second cell value in "Columna". How can I do this with no using a Datagrid?

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.net - Update DataColumn's With Latest Column Information?

Nov 26, 2009

I have a dataset with a number of data columns, due to sizing issues I've updated a number of the varchar columns from say VARCHAR(20) to VARCHAR(50).I'd like the DataTable to automatically grab the new column information, is this possible? I'd rather not go through each column in the table and update the length.

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Custom Function For Datacolumn.expression Property

Jan 23, 2009

i read an article about datacolumn.expression property here [URL]. this is really great. but i was just wondering, for my case i want to use my custom function to use in the expression. basically, on my datatable i added an unbound column AGE. when i display records, i just want the age textbox to be populated with the computation of the person's age based on birthdate.

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Prevent Empty Columns From Loading In A Datacolumn?

Aug 13, 2009

Prevent an empty column in Excel to be loaded into a dataset column?

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Preventing Empty Columns From Loading In A Datacolumn?

May 11, 2011

how to prevent an empty column in Excel to be loaded into a dataset column?

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