How To Initialize Initial Position Since It Has No Length
May 2, 2010
I am making a simple home inventoy windows form that uses writing to a text file, reading to a text file, and arrays of structures. The first two I have a good idea how to handle but, the third one is where i have a little trouble. I dont know how to initaializing the data in my structure, how do i initialize the initial position since it has no length? I have initialized them in my module [code]now i need to assign the first value to it, but im not really sure how without anything in it to use my length method
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Nov 10, 2009
initialize an indefinite (eg. Decimal) array without setting boundaries on the array length?
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Aug 2, 2011
given the following Sub, how would I initialize byte array 'temp'to zeros and give it the length of the incoming byte array passed into the subroutine?
Sub ReceivePacket(ByVal buffer As Byte())
Dim temp() As Byte 'initialize to zeros and length of buffer
temp = buffer.Skip(17).ToArray()
End Sub
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Apr 17, 2009
this is not working?
[Code]...
End WhileI am trying to read from the ": " to the end of the line. I keep getting this error: Index and length must refer to a location within the string. Parameter name: length
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Feb 17, 2011
am getting the above exception while swaping Items in the list(lstRoutePriority).PFB my code
if (lstRoutePriority.SelectedIndex > 0)
{
//Swap the two items
[Code].....
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Jan 6, 2010
I have a field displaying on a datagrid that the user has asked to be variable length based on the data that is returned. Is there an easy way to determine how many characters are returned for a field and then converting that to a pixel length so that I can change the length of the field in the code.
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Mar 23, 2009
"Index and length must refer to a location within the string. Parameter name: length" whenever I run this code
[Code]...
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Jul 21, 2010
If using the following in an if statement I get an error: If trg.Name.Substring(4, 6).ToUpper <> ("ABCDEF") Then I get the error: "Index and length must refer to a location within the string. Parameter name: length"
I assume this is because the string (trg.name) is too small for the 4, 6 substring. What would be the correct method of working around this problem? VB.net Studio 2008.
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Aug 24, 2009
I have looking for a tutorial or class that demonstrates more than a trivial example of saving a windows position on closing. The ones I have found don't seem to work on all systems because of:
1. Multiple monitors. (and resolution between those monitors)
2. Toolbar size and position (toolbar is only on the primary monitor, well sometimes)
3. Sometimes the programs dont open on the right monitor they were closed on.
Is there an extensive class or tutorial on all the stuff a programmer needs to get right to have a window size and position persisted between executions?
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Dec 5, 2010
I am using the following code to populate data in Textbox1:
[Code]...
I have few functions assigned in TextBox1_TextChanged event. The problem i am facing is this event is fired twice, once after the Fill command and another after the Position command whereas i want the event to fire only once after the Position command. What should i do?
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Feb 26, 2011
I am Loading a Combo box with values..
cbox.Items.Add(New combodata("A", "Red"))
cbox.Items.Add(New combodata("B", "Black"))
cbbox.Items.Add(New combodata("C", "Blue"))
[code].....
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Jan 6, 2010
I have data like this in my text file
(23.0001.0)
(23.0002.0)
(23.0078.0)
[code]......
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Jun 2, 2012
If I place it on the form, I want to have the text as the name of the control, like label1, label2, etc.[code]...
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Nov 7, 2011
I am using a form with a combobox which is populated from an SQL database table. This works OK but is it possible to leave the box blank on the form until a value is selected.By default the box has the content of the first record.
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May 23, 2011
I'm writing a forms application. I'm adding a piece that allows you to double click on a row of a datagridview control to open a new form with more details. These additional details are pulled from a database, which takes a bit of time to finish.If I run the DB query from the form's load event, the form doesn't show up until everything in the load event has completed, which can take several seconds.I want the form to show up instantly when you double click, and all of the fields to be populated once the data is ready.Is there an event I should be using other than Load?
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Apr 5, 2010
I've never come across this before:I have a series of text boxes. The text of these boxes get set on page load. then I have a submit button that calls a sub to update the table with the new values (text) in the text box. The problem is it is keeping the original text not the text that is CURRENTLY in the textbox. Anyone come across this before? Or know how to get round it?
[Code]...
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May 11, 2009
When i open a file with the proces method en i try to open another file, the openFileDialog box start with the last directory and filename. In the property i write a initial directory. How can reach the situation that the box always start with the initial directory i give.
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Jul 5, 2011
I have a datagridview and need to do some formatting to it. On load the row 0 column 0 cell is highlighted. I need users to click on datagridview to select a value. The issue is with the initial load highlight it looks like the first row is already selected when in fact it is now. How can this highlight be disabled? Each row of has 7 cell, the user is able to select any of the cell of a row and the corresponding row ID is selected. The issue is that only that one cell is highlighted.
I would like the entire row highlighted regardless of what cell in that row is clicked on. One of the columns is a status value. I would like to color the text based on the value. For example if the Status is opened I want the text to be red, if the status is closed the text color should be default.
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Mar 9, 2012
I need to run an If Statement that will check a few conditions.
Basically I want to get it to check a value held in a variable "Temperature" and if the value is within "1" eaither way i.e. +-1 of the value held within the variable to then to output a text string to Label200.Text Else if the condition is not met then out put another text string to Label200.Text.
Example:
Say if Temperature value held in the variable Temperature is 8.5 the if statement checks to see if the DewPoint value is "between" +-1 of the temperature value. i.e. 7.5 to 9.5 as well as the value in Humidity is equal to or greater than 90 and Pressure is Less than or Equal to 1013.25 then the conditon is met, else the conditon is not met.
I have put some code together below in NotePad++ to see if what I am trying to do is the correct way to go about it (note I have not yet tried this code in VB.NET as I don't have it at work).
pass comment on the code and if it is wrong explain what I should do to get it to work.
Dim DewPoint as Single
Dim Temperature as Single
Dim Humidity as Single
[Code]....
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Aug 28, 2009
I'm creating a Windows Console application written in VB.NET and I have a few processes that need to be called only once during the lifetime of the application. If it was an ASP.NET application, I put these in the Appliction_Start method of the Global.asax.vb file. Since there isn't a Global. asax. vb for Console applications, is there an event I could handle that allows me to call my functions before Main is called?
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Jun 12, 2009
I'm used to Access and have just created my first form in VB in Microsoft Visual Studio. I have added four check boxes to a form and they are connected to a SQL database and working fine with one exception: When I create a new record, the initial state of the checkbox is null so it shows a green square in the box and you have to click twice to actually place a check in it even though in the properties, the three state is set to false.
When I go into DataBindings/Advanced, and set the null value to zero, it fixes the problem with starting out as a null state in a new record, but then when I create a new record it carries the checked and unchecked state from the previous record over. (If it's checked in the current record and saved and then you click on new record, the checkbox stays checked.) I can't even figure out the correct syntax for manually setting the checkboxes to a false state in the new record event to fix it.
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Oct 5, 2010
My For... Next Loop will not work and I cannot for the life of me figure out why. I have tried to display the results in a label and a text box with multiline enabled. Doesn't seem to matter. It's probably something obvious I have been overlooking for 2 hours.
Option Explicit On
Option Strict On
Option Infer Off
[Code].....
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Jul 4, 2011
I have an application with three panels, each containing radio buttons. At design time, all are set to Checked = False
When I build & debug the project, one radio button on one of the panels is set to checked = true.
For the other two panelsl, none is set to Checked = True.
I want no radio button set to checked = True when the project starts. How do I engorce this?
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Sep 24, 2010
Im trying to Separate Last name, First Name and Middle Initial. File is csv format, here is an example:
[Code]...
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Oct 18, 2010
I want my user to only be able to open files in the initial directory that I set on OpenFileDialog. I have googled a bit and found you cannot restrict, but that was information from a few years ago and I'm not sure what version. Has this control changed at all in VS 2008?
My application is handling it okay if the user does navigate out, but it would be more concise if I could prevent him from doing so in the first place. And the fact that I have found others who wanted to do this also, makes me think it might be a nice property to have built in.
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Jan 16, 2010
how do i set my initial value for textbox as blank. I tried to I load my textbox a data coming from my database but what my problem is that I need to set my default value for textbox as blank because everytime I load the forms the textbox will be filled immediately with data. This is how I bind my textbox and combobox after loading from database.
cbxJoblvl.DataSource = myDataSet.DefaultViewManager;
cbxJoblvl.DisplayMember = "Joblevel.lvl";
cbxJoblvl.SelectedIndex = -1;
txtLvlName.DataBindings.Add("Text", myDataSet.DefaultViewManager, "Joblevel.lvlname");
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Jan 31, 2012
When I load in the file to my program.
GPRS: 232154,456464,546
IP Addr: 123.456.2.789,9001
Interval: 12.5422
It appear Length cannot be less than zero. Parameter name: length.
My program is...
Private Sub Loadbtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Loadbtn.Click
'Dim strFileName As String
[Code]....
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Mar 9, 2010
I also have a function that returns ALL tiles on the map and they're X, Y position. How could I find out which one is closest to the position I specify? I can't figure out how to go about it. how to implement it with this. Heres a MADE UP example if what I'm trying to do:
Dim MyPosition as New Position()
MyPosition.X = 400
MyPosition.Y = 400
Dim tList as New List(Of Tile) = MyMap.GetTiles
Now, I can already do the stuff above, but what I need to make is something like this:
tList.GetTileClosestToPosition(MyPosition)
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Sep 3, 2009
I'm using System.Net.CookieContainer. I fetch an initial webpage which populates the container. I want to make a copy of this container to use in the future. Is there an easy way to do this in .NET? I'm still new to .NET.
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://www.google.com");
HttpWebResponse resp = null;
CookieContainer cc = new CookieContainer();
req.Proxy = null;
[Code]...
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Apr 20, 2009
We want to Replace some text from a textbox (multiline) with = the text in our combobox and we want to replace it with its new one (in a textbox)
heres our code
If TextBox7.Text.Contains(ComboBox1.Text) Then
TextBox7.Text.Replace(ComboBox1.Text, TextBox1.Text)
End If
so that says, If the textbox(multiline) contains whats in our combobox, then replace it with the text in textbox1..
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