Got an array, why cant I save dataread info to array pos?
While myDataReader.Read()
' txtPhone.Text =
Tempstr(i) = myDataReader.Item("Phone").ToString + vbCrLf[code].....
apparently Object reference not set to an instance of an object.
I would like to retrieve a single column of about 800 rows in a table and save these values in an array so as to reference them later on. How can I do it? I tried:
[code]...
And it didn't work. The col1 is of type Int64 and so is the array prev_ob(). Please let me know how I can save it to an array.
I have an SQL statement like:
SELECT FNAME, LNAME, CITY from EMPLOYEE
How do I create a multi-dimensional array from a datareader which should store values like:
John, Doe, LA
Mike, Johnson, PASADENA
Freddy, Kruger, Long Beach
I want to load all of the LOCATIONS in the Location table to a Combobox and then for any found locations (in another table) to be deleted from that combobox. Im using a Array list, but can't get the Data reader to write to the Array list.
Dim SQL As String = ""
Dim Reader As OleDbDataReader
Dim i As Integer = 0
Dim LocationArray As ArrayList = Nothing
[Code]...
How do I load data from a datatable into an array.
Dim
dtDataTable As New System.Data.DataTable
dtDataTable = dsStaffHoursWorked.vwGroupProjHoursDate
Dim DRs = dtDataTable.Select("enddate = '05/14/05'")
How can I fill this Percentage array with Sql data reader..
Dim StudentID As Integer = Me.ComboBox1.SelectedValue
Dim Percentage() As Integer
Dim con As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=D:Database
[code].....
I am not sure how to phrase my question properly but I want to achieve something like this.
I have a class named Products public class Products
private ID as Integer
private Name as String
Public Property ProductID()
Get
Return ID
[Code]...
When I do the same, I am getting an error "Object Reference Not Set to an Instance of an Object.
I am using a datareader to pull data from my database. I store the data in a multidimensional array in a seperate class file. I access the values in the array from a form through properties.The problem I am having is when I run the project as I step through the code I can see the values being added to the array but when access it from a string property it shows up as string System.String[,]. I would like to have my array transposed accross the listview under the corresponding column. below is the code I am using.
[Code]...
I have a problem with my project. here is the problem:
My code for login is as follows:
dim conn as SqlConnection = New SqlConnection("Data Source.................)
dim cmd as SqlCommand = New SqlCommand("Loguser",conn)
cmd.CammandType = CommandType.StoredProcedure
[CODE]...
Now the error i get is that "there is a datareader associate with this connection that need to be closed"
Can I save an array into my .bin file then read the array again just like a string or Integer??
View 2 RepliesI want to compare two array and save the miss match character into 3rd array.
View 1 RepliesI have a 2d-array but the array is made of a class and I want to know what is the best way to save this array so I can edit and bring it back up and save it back when needed.
So I have this class
Friend Class CellValue
Public CellColor As Color = Color.White
Public CellShape As Shape = Shape.Blank
Public CellName As String = ""
Public CellLocX As String = ""
Public CellLocY As String = ""
End Class
[Code] .....
Apparently the system.collection.arraylist does not work since it is more of a list than anything else. Is there some sort of collection that will save my array as is so that it can be retained latter on application load?
View 5 RepliesI have 2 Structures
Public Structure One
Public ItemOne As String
Public ItemTwo As Integer
End Structure
[Code]...
Results In an Unhandled exception. Bad Record Length. and then If I close it and reopen it I get an 'Unable to read beyond end of stream' error. So what is the best way to save an array of structures? Binary Reader/Writer? and why does this way not work (Even if its derived from VB6)
I have a two dimensional array as string and I what to save it to a file, what should I do?
View 1 RepliesI have Dim a(15) as integer i wont to save this array in Viewstate .
View 2 RepliesI am writting an application in VB using VS2008 and SQL2005. I would like to save an array to my database and later retreive it. I understand that I need to serialize the array to do this but don't understand the process. I have looked at various resources on the Internet but seem to be missing something.
View 2 RepliesI have a string array that is populated with thousands of entries. I am wanting the quickest way to save this data to disk and to also load it back up.
Currently I am looping through the array and appending this data to a string and then saving this string. This takes a long time.
What is the fastest/most efficient way to do this?
How do you save an array or an arraylist in vb.net using My.Settings? I cannot find the array type anywhere, even in the browse window.I absolutely need to be able to save this.I know I can convert the array to a string, but I do not know how to convert a string to an array. I know that if I were to break it at a delimiter then I could convert a string to an array, but my problem is that any text at all could be stored within the array as a single value, so I cannot pick a delimiter that is likely to be used.
View 3 RepliesI have some code in a module:
Public esUsefullitems as new arraylist
That declares my list and I am using a simple structure to store data in but what I was wondering how can I save the arraylist to my.settings without getting a nasty object reference is not set to an instance of an object error, I know this involves using the 'new' method but I have tried many different ways of doing it but I still get that error, how do I do it?
Now i have some images and i have a database (MS Access)i need to convert all images to !one byte array!(couse i have 1 column for images) and i save this array. Then when i need a picture i should take some pic on this byte array.umm i think i cant explain my status :)
i need to cut this byte array like split function. so then i can choose image whatever i want
saving and loading to a file. I am using Visual Studio Express 2008.
I have an array as follows:
Dim m(100,100) As node
Public Structure node
Public i As Integer
[Code]...
and I'd like to save to a file the m array.
I am not particularly bothered about data security and looked at xml serialization but cannot get this to work to save the m array.
I am using visual studio 8. vb.net.I have an array, array1(100,8) and I want to save it as a csv file so that I can open it in excel and examine the contents more closely. The feature, of saving as a csv file, is not going to form an integral part of the finished vb app, I just need something quick and dirty because the data in the array just requires looking at in excel so that I can fully understand its significance and thus continue coding my app.
View 2 RepliesPrivate Sub LoadButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoadButton.Click
Dim lin(8) As String, filRead As StreamReader, i, x, t, d As Integer
[Code].....
I am getting a run time error it is not saving to textfile
I am writing a program in VB10 and the programs purpose is to read an encrypted text file and decrypt it into a textbox onscreen. You can then save the text.The problem is that it keeps saving text in files like this:
H
e
l
l
o
I cant figure it out. Here is my save array code:
First the savefiledialog
Sub SaveFileDialog()
Dim strFileName
[code]....
I need to save array into excel file. I'm using code taken from [URL]
Dim oExcel As Object
Dim oBook As Object
Dim oSheet As Object
[Code]....
But i want to let users to choose folder and filename themselves instead of determining location and filename like in those code above oBook.SaveAs(sSampleFolder & "Book2.xls") I wonder if i can use SaveFileDialog but i dont know how to do it. Or is there any other way to do this?
How can i save an array of string to disk??
lets say we have
Dim myStringArray() As String = {"A","B","C","D",.......,"Z"}
and wanted to save it to a binary file on my disk.
later i want to be able to read it and load it into memory.
My homework task is to add data to an array of records and then save this to a file.
I'm having problem saving to a text file. I have the following code:
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Dim SW As New StreamWriter("Records.dat", False)
[Code].....
In my test example here I realise that the reason I have 4 lines written is because I have 4 elements to the array, but why am I getting this gobbledegook instead of records with a name and age?
I know I have added the data correctly to the structure because I can redisplay it elsewhere on my form. I just don't get how to save data in a structure to a text file.
My task requires use of an array and/or array of records, a text file
Here's the code i've used in the past to save an integer array to settings (The setting being listed as a String on the dropdown):
Save:
vb
sec0string = String.Join(";", Array.ConvertAll(sec0, Function(n) n.ToString()))
Load:
vb
sec0string = My.Settings.sec0
sec0 = Array.ConvertAll(sec0string.Split(";"c), Function(s) Convert.ToInt32(s))
Suppose i have an image and i extract each pixel color and store it in a color array, is there any way by which i can save the color array along with the image? I was thinking about converting the color array to string and then integer and then append data to a text box, but then again i must store the text along with the image....and i dunno how to do that?
View 1 Replies