"System.OverFlowException" When I Try To Create A New Datatable?
Feb 19, 2010I have an application where there is a sub that creates a new datatable object. This line of code will randomly generate the following error;
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System.OverflowException - 'Arithmetic Operation Resulted In An Overflow'
Dec 16, 2009When I Run my app, I get a pop up box saying this 'Arithmetic operation resulted in an overflow'. Here is the code;
[Code]...
how to fix this issue?
System.Data.DataTable - Create A Dataview And Then Loop Through View
Jun 25, 2010im trying to select some rows based on a criteria, i was wondering is it faster if i create a dataview (based on the criteria) and then loop through the view? or should i loop through the entire datatable and check the criteria manually.
View 5 RepliesVS 2010 : System.ArgumentException Was Unhandled Message=DataTable 'get_item_list' Does Not Match To Any DataTable In Source
Apr 21, 2010I 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
vb.net
Friend Function CreateTable(ByVal tableName As String) As Boolean
Dim table As New DataTable(tableName)
table.ReadXmlSchema(tableName & ".xsd")
[code]....
this however produces the following error on line 3
Quote:
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)
OverflowException Was Unhandled
Aug 8, 2011OverflowException was unhandled
View 8 RepliesLoading Big Files To Ram OverflowException
Jan 2, 2012It looks like an array of byte only uses a 32bit length and cant hold more than 2GB why is it not a 64bit length when the project is 64bit, how can I load bigger files?
View 10 RepliesASP.Net Error - Unable To Cast Object Of Type 'System.String' To Type 'System.Data.DataTable'
Oct 4, 2009I get the below error Unable to cast object of type 'System.String' to type 'System.Data.DataTable'.This is the code I'm using
Dim str As String = String.Empty
If (Session("Brief") IsNot Nothing) Then
Dim dt As DataTable = Session("Brief")
If (dt.Rows.Count > 0) Then
[code]....
Asp.net - .Net Iniatialising A Class Using System.Reflection And System.Type To Create A Session Based Singlton Extension Method
Jun 11, 2009I have had several occasions recently to access a specific class several times over a relatively small time frame.So I've been storing the value of the class in Session and trying to access it on page load, if it's not available creating a new instance and storing that in session.
So instead of constantly replicating the same code for different classes on different pages I'm trying to create an extension method to do this for me.
[Code]...
I'm stuck on what to do when I make my new instance of my class (it would have to have a New() sub)
I'm not sure where to go from here... or even if this is the best way to do it.
Nable To Cast Object Of Type 'System.Data.DataViewManager' To Type 'System.Data.DataTable'
Feb 19, 2010I added this lines in the form load of DataGridPrinter by Merrion in the codebank..[code]Unable to cast object of type 'System.Data.DataViewManager' to type 'System.Data.DataTable'.
View 2 RepliesUnable To Cast Object Of Type 'System.Data.DataTable' To Type 'System.Data.DataView'
Dec 31, 2009every time i run this code i get the same error
Unable to cast object of type 'System.Data.DataTable' to type 'System.Data.DataView'.
the code is
Dim plmExcelCon As New System.Data.OleDb.OleDbConnection
Dim cmdLoadExcel As System.Data.OleDb.OleDbDataAdapter
Dim PrmPathExcelFile As String
[Code]......
.Net System.OutOfMemoryException Filling A Datatable?
Sep 24, 2009I need to extract data from a .dbf file and transform it into xml. I wrote a routine that does it just fine. However now we are encountering very large .dbf files - like 2GB +. And this code throws an OutOfMemoryException on those files.
Public Function GetData() As DataTable
Dim dt As New DataTable(Name)
Dim sqlcommand As String= "Select * From MyTable"
[code].....
'ToQueryable' Is Not A Member Of 'System.Data.DataTable'?
Dec 17, 2010I have imported:
Imports System.Xml.Linq
Imports System.Data.SqlClient
Imports System.Data.DataTableExtensions
[code].....
Create A Folder In A Networked System From Another System?
Sep 17, 2009i want to save a jpeg file from one system to another system which is connected through network.its in a windows application.my target system's name is "abc".how can i do this ?
View 2 Replies'System.data.datatable' Cannot Be Indexed Because It Has No Default Property
Jun 2, 2011[code]This is my Code the error is Class 'System.data.datatable' cannot be indexed because it has no default property.. When i try this code in oledb it works but here it wont..
View 1 RepliesVS 2010 Convert System.Object To Datatable Or Array?
Jul 18, 2011I'm pulling data from a D3 database, using an api.
The api can do the following: Dim OBJ As Object = mvsp.MVResultSetGetRows.ToArray()
But how do I get that data into a datatable to use as the datasource for a DataGridView?
C# - Enable The User To Apply A Custom Filter To A System.Data.DataTable?
Feb 16, 2012I 'd like to enable the user to apply a custom filter to a System.Data.DataTable.At the moment I have a very simple function like this:
Dim result = dataTable.Select(txtUserInput.Text)
With the filtered results I'd like to do further operations(e.g. Database Update/Delete).Is an sql injection protection needed or is the "Select" function secure?
//Edit:Can the "select" function be abused to manipulate any data in the datatable, execute code, ...? If the only danger is that this function can return to much/to less data there is no problem. But if the data in the dataset gets corrupted it's a real problem.
Create A Datatable In .NET?
Jul 11, 2011I am trying to create a datatable in VB.NET, but when I output a row from this table it shows: "System.Data.DataRow".I have compared my code to several websites and it seems correct. However if I instead Response.Write these values they display correctly.
[Code]...
C# - Create A String From This Datatable?
May 5, 2012I have a datatable with three columns
Id name value value1
I want to create a string from this datatable so that each row in datatable will create two rows name will become one row value 1 will become another row
If name and value1 are similar then include value 1 only otherwise include both name and value1 (this is done)
If name of one row is similar to name in any other row, then add following text infront of both duplicate rows in string
Id is similar to Id
This is what I have written so far:
Public Function GetGazetteer(dataTable As DataTable) As String
Dim processedData = New List(Of String)
Dim rowData = String.Empty[code]....
Create DataTable From Program?
Jul 16, 2010So I'm sure this sample code exists somewhere, but at this point I just need some guidance. What I am trying to do is import all of the data from a CSV I have (it's about 100 columns of data that are numbers, not strings, and have headers) and create a DataTable so that I can plot to a 3rd party chart control called Zedgraph. The problem is that when I plot columns from the DataTable that is created by the following code, it simply plots a diagonal line of the points count (in other words, if I create a curve from a column containing 400 data points, it plots a line from 0,0 to 400,400, instead of plotting the actual data). What I think I have finally figured out is that I'm importing the data as String, rather than Double or whatever other number type I could use. The problem is that I cannot seem to get any OLEDB connection to actually fill my dataset, so I have had to stick with this code for now. FYI, I am using Visual Basic Express 2010 and the file is a CSV created from Excel 2007. [code]...
View 2 RepliesCreate A Datatable Dynamicly And Use A Datagridview?
Jan 9, 2010I want to make 2 planning forms, one for persons and one for materials. The most ideal situation is when it can be in 1 form and switched by using an option field at the top.
- The information is coming from a SQL 2008 database.
- Vertical the persons or materials must be shown(dependent of the option field).
- Horizontal every day of the year must be shown, so the number of columns will be 365.
- At the crossing the number of hours must be shown.
- The form must be build as fast as possible.
I tried to create a datatable dynamicly and use a Datagridview. The advantage is the information, which must be shown, can easily be changed. The disadvantage is it is slow.What is the best method to do this in VB2008?
Asp.net - Loop Through Datatable To Create A String?
Feb 23, 2011I want to loop through my datatable column called SDESCR and created a string that looks like this.
Dim labels As String() = {"North", "South", "East", "West", "Up", "Down"}
this is what i am trying and it is not working
Dim labels As String()
For Each row As DataRow In tablegraph.Rows
labels = labels " ' " + row.Item("SDESCR") + " ',"
Next row
Create A Datatable And Try To Load Sqldatareader
Apr 6, 2010Scenario is this; I've a sqldatareader query that seems to be returning nothing when I try to convert the sqldatareader to a datatable using datatable.load.So I debug into it, I grab the verbose SQL query before it goes into the sqldatareader, just to make sure it's formatted correctly. I copy and paste this into SQL server to run it and see if it returns anything. It does, one row.I go back to visual studio and let the program continue, I create a datatable and try to load the sqldatareader but it just returns an empty reader. I'm baffled as to what's going on. [code] Ok I've done a loop to count the rows of the datareader before using the datatable.load method. In my test query I'm getting 4 rows (the correct amount) in the datareader, as soon as I use the datatable.load method it says the datatable is empty, what's going on?! So it seems a datareader is a one-way thing, iterate through it to get the row count and it's essentially empty as far as any other bit of code is concerned. Didn't realise it was forward only and wouldn't 'reset' once read through.
View 1 RepliesCreate A Datatable To Be Shown In A Datagridview?
Jul 13, 2009I am trying to create a datatable to be shown in a datagridview.. i have created a DataGridViewComboBoxColumn that has a data source and now i wanted to create a DataGridViewTextBoxColumn but i dont know how to make it take its data from a column in a table.. i did it with the comboboxcolumn but i coudnt do it with the textboxcolumn..
View 2 RepliesCreate A Datatable Using Contents Of A DataGridView?
Feb 20, 2010I want to create a datatable using he contents of a DataGridView.
View 9 RepliesCreate A DataView From The Dataset / Datatable?
Jan 2, 2010How to create a dataview from a datatable?
What is the basic use of the created dataview?
Create New Datatable By Linking Two Other Datatables?
May 27, 2010I have two datatables, which come from different sources. One is Sales, the other is Products. What I'd like to do is create a filtered version of Sales, in that in that it contains Sales which have a matching ProductID in Products.
View 11 RepliesDynamically Create Chexboxes From Datatable ?
Mar 22, 2009CODE:
I am working on a winform project. like to display result of datatable in a dynamically created chexboxes.see sample picture.
How To Create DataTable In Windows Application
May 21, 2009How can I create datatable in windows application in C#.net. I want to store a temporary data into the datagridview from textbox to grid. I know it work in asp.net. Is it possible in windows application C#.
View 2 RepliesHow To Create Datatable With Multiple Records
Jun 6, 2009How to create datatable with multiple records.
View 6 RepliesClass - Create Extension As DataTable(Index)
Dec 30, 2011I have a question related with VB.Net Code. I see that the DataTable we can use: DataTable(0)'This return a DataRow with the selected index In the intellisense I see that this functionality can achieve with a extension... but, If I create a extension, always I need refer the Extension before to use it
[Code]...