Creating Variable - Expression Does Not Produce Value
May 1, 2011
Why I cannot get a variable to come in. I keep on getting the error "Expression does not produce a value" for one of my Dims.
Imports System.IO
Public Class Main
Dim image_1 As Integer = Openimg1.FileName
'The line below is the one causing my problem
Dim image_2 As Integer = My.Computer.FileSystem.RenameFile(Openimg1.FileName, "_hid" + System.IO.Path.GetExtension(Openimg1.FileName))
[Code] .....
So basically, how can I create a variable from something that has yet to be created?
Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click If UsernameTextBox.Text = ("username") And PasswordTextBox.Text = ("password") Then MainMenu.Show(Me.Hide) Else MsgBox("Wrong") End Sub
But it gives me the following error:
Error 1 Expression does not produce a value (on Me.Hide)
I am getting the error:"Range variable 'sender' hides a variable in an enclosing block or a range variable previously defined in the query expression."for this
Imports System.Data.SqlClient Imports System.Linq Public Class Form1
[code]....
I can select any other item from the table without the error. "sender" has the same properties as "receiver" in the SQL table.
I am Creating a Lambda Expression, but it' not getting me the write Out put :
Public Class Form1 Delegate Function GetLastChar(ByVal S As String) As String Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code]....
I want Send a Name like "Arindam" and its return me "m", the last character.but in messagbox return value shows "fasle" I can't under stand why it's showing "False" instead of "m", the last character.
I have a lambda expression that builds a list ofanonymous types. I would like to include a property in the anonymous type that is a counter. So the first entry is 1, second 2, third 3, and so on.I thought I recallenyone know the syntax for defining an indexing variable as part of a Linq query or lambda expression?
this list has tried to mix numerical variable, such as 1, 2,3 within an xpath expression. [code] For some reason, item_ number_ first and item_number_last appear to have no value in the above code snippet, when they do have values they get printed as in the [code]Could anyone please give me some hints on what to modify here to make the numerical data be able to mix within my xpath?
WINDOWS PLATFORM: WINDOWS 7APPLICATION LANGUAGE: VISUAL BASIC 2010 EXPRESSWINDOWS FORMS DESIGN.CONTROLS: CHECKBOXES, RADIO BUTTONSDear VB Programmers,The function of the checkbox is to: check whether the application will display a particular page @ start up or not.
i want to declare an array with a name that is the value of a variable. I need to do this because i want to create arrays from a text file that i'm reading.Basically, if someone could make this work then i should be able to change it to fit my use.
Dim var1 As String = howdy
Dim var1() as Integer
In this case i'd like to be declaring an array with the name 'howdy' that stores integers. In reality i'm looping a bunch of read names and would like to create an array for each name i read- but i'm quite capable of sorting the rest.
I have created an array of 6 numbers which are randomly generated, I can create a graph using six randomly generated numbers, however what I want is to use the random values that are placed in the array to create my graph, I have enclosed the code that I have:
Private Sub btnGraph_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGraph.Click txtAns.Text = ""
is there any way of creating a file in visual basic using a variable as the file name? I have tried using the following but keep getting an error "The given path's format is not supported." ??? I am trying to create a log file of machine use every shift (8 hours) and just want to use the same name for the file with the date and time appended to the end of the file name. the section of code giving me the error is below.
how do I DIM a variable's name using previously declared string varialbes? I have been using PERL for processing data stored in text files but I now have a business need to use VB2008. I would like to do something like this:
dim name1 as string = "ABCD" dim name2 as string = "123"
'here is the part that I don't know how to do - create a 3rd variable name concatenated from name1 and name2:
dim string.concat({name1,name2}), or maybe use a counter in a line like 'dim namex as string' with x being a counter value.
Essentially I want to dim variables using text strings extracted from a file. In PERL I have declared literals and arrays, such as 'my @$name1', which creates an array named with the contents of $name1. In VB2008 I am not sure how to make this work with the DIM statement.
Edit: Here is a much more simpler example of this issue (i've deleted my original question):
Dim numbers1 As New List(Of Int32)({1, 2, 3}) Dim numbers2 As New List(Of Int32)({3, 4, 5}) For Each n1 In numbers1 ' no warning ' Dim contains = numbers2.Contains(n1) Next
[Code]...
The local variable number1 is redundant and makes the code less readable as @Meta-Knight already has emphasized. Note: All three ways are safe and give the correct result.
Possible Duplicate:Why is it bad to use a iteration variable in a lambda expression.why do I get: "iteration variable in a lambda expression may have unexpected results"? Suppose I have the following code:
Is it possible to create a variable that is global for each session in ASP.NET? Usually I do this with Session:
Session("my_variable") = 10 But this necessitates casting it every time I want to use it like so: Dim my_variable as String = CInt(Session("my_variable"))
I'm trying to elaberate on some basic examples of .Net programming in using VB. The basic example of creating a new instance of Form1 is: Dim x as New Form1 x.Show I've added some OptionButtons to set the StartPosition of the Next Instance of Form1 as well as some Labels that display the Top, Left, Width and Height properties when the new instance of Form1 is Shown.
This is the code I'm using. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim x As New Form1 If Me.RadioButton1.Checked = True Then x.Top = 0 x.Left = 0 [Code] ......
I need to store elements in a multidimensional array. Specifically, I need to save "tiles" to a grid (e.g.Grass at x:2 y:5, Dirt at x:3 y:5, etc.). Using a multidimensional feels very hacked up and is very glitchy (having to resize my arrays and having to create new ones were they are non-existant). Is there some kind of element made for this? Something I can say obj.getPos(2,5) and get my Grass Element and use obj.setPos(DirtObj, 3, 5) to set it to my Dirt Element?
I'm just wondering if there is something easier to use than multidimensional arrays in vb.net, that is all.
Ok I'm creating a sql query with a string variable and executing it in vb. The string would look something like: Insert Into Table (vara,varb,varc) Values ('vara','varb','varc') This works fine.
Im trying to create a diary system that on click event of the built in calander in vb.net opens the current diary entry for that day. i am using the my.settings variables to store the entrys the problems i am having is how to create a my.settings variable automaticly if one dosnt exist for that date (will be using the date of the clicked day as the name e.g. 10/5/2011)
So basicly i want the user to be able to click through the dates on the calander and the entry be displayed in a text box next to it, blank if nothing is there and the user can edit/save them after just need the code to auto create and i guess how to search the my.settings im quite new to using this storage, i normally use text files. the pic shows the program so far, it has one diary entry but it has no relation to the date. the label is linked to the calander also , displaying the selected date.
im trying to create a diary system that on click event of the built in calander in vb.net opens the current diary entry for that day.i am using the my.settings variables to store the entrysthe problems i am having is how to create a my.settings variable automaticly if one dosnt exist for that date (will be using the date of the clicked day as the name e.g. 10/5/2011)so basicly i want the user to be able to click through the dates on the calander and the entry be displayed in a text box next to it, blank if nothing is there and the user can edit/save them afterjust need the code to auto create and i guess how to search the my.settingsim quite new to using this storage, i normally use text files.the pic shows the program so far, it has one diary entry but it has no relation to the date.
GenerateTheList is function.Need help Private Sub buttGenerate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttGenerate.Click Dim thread1 As New Thread(New ThreadStart(GenerateTheList)) thread1.Start() End Sub
