VS 2008 Check Textbox For Double?
Sep 25, 2009
I am having trouble using an If statement to check to make sure the value entered in a textbox is a double. I was told to use double.parse to check this but I can't get it to work right. Anytime I run the program and type text into the textbox, it tells me the code is not right.
Here is my
Dim DblFahrenheit As Double
If TextBox_FahrenheitTemp.Text.Length = 0 Then
MessageBox.Show("No temperature was given. Please enter a temperature to convert.")
ElseIf DblFahrenheit = Not Double.Parse(TextBox_FahrenheitTemp.Text) Then
[Code]....
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Apr 4, 2009
In vb.net, im using objWriter.Write("playerA= "x"")as you can see im using double quotes inside double quotes, how do i skip it so the error doesnt show up?in php you make an "" to skip the string like ("playerA = "x" ")
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Apr 12, 2009
So I have a keylogger so everything I type shows up n the textbox I want to make it so if I type a certain word like a kind of password my application closes
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Jul 26, 2011
I have a datagrid displayed. I want to be able to show a tool tip on the cells that have info. The info I have the tooltip are the results of a store procedure that I run, and sve the results as a string value. Then pass that value to the tool tip. My strore procedure works properly in SQL. And when I hard code values in my code, it works just fine. I step through the code and the values the SP needs are correct, just the output is Null. My biggest concern is how I'm calling this, under cell formatting.
Private Sub QDGV_CellFormatting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles QDGV.CellFormatting
If e.Value.ToString.Length = 4 Then
[code]....
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Aug 3, 2009
I have a folder called "Documentation".I also have a menu option in my windows form app called "Help" that I want to launch a web browser and load the index.html file within this Documentation folder.To have this folder be copied to the installation directory at time of install, do I just add the folder to my project?How do I code the "Help" menu option to open a web browser and navigate to this folder?
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Feb 16, 2011
How to check the Single byte character (e.g. English) and Double bytes character(e.g. Chinese) ?
Since I want to printing out their code which are representing in Hex.
However, Single byte character is using 2 digits of Hex. And Double bytes character is using 4 digits of Hex.
So, how can I check them and output with more readable pattern ?
input likes: 微軟 Microsoft output likes: B74C B36E 4D 69 63 72 6F 73 6F 66 74
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Jun 16, 2009
I want to see if a variable's type is string or double type. How to do it in vb.net immediate window?
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Feb 12, 2009
I want to add the ability to spell check a few textbox fields on my form. I've seen a few thread on this forum regarding spell check, which works fine, but I also want that wavy red line under any misspelled words just like in Word.
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May 23, 2010
I'd like to make a textbox that accepts only numbers, but not integer, but rather double.I've read here about e.Handled = Not Char.IsDigit(e.KeyChar) and it works, but again, it can be used only for integer, since it declines decimal point.Another thing I've read here is If Not Double.TryParse(TextBox2.Text, value) Then .... and it would work fine, except that it allows only decimal comma instead of point.
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Jul 25, 2010
I've been trying to feed a multi line textbox into a string array then check item by item if a string contains part of it.
[Code]...
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Jan 27, 2011
I have a situation where I am handling both single & double mouse click events on a form. In both cases something has to be loaded, however when a double click occurs, I do not wish to execute the code attached to the single click event.Is there a way to intercept the mouse click's and check if double or single and then execute the right event appropriately?
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Nov 17, 2010
I have a htpc project that I am working on. The main program loads dll plugins which are basically other win forms. On each of these forms, including the main program, I use a picturebox (a double buffered picturebox) for the background image and then draw everything on it by hand. Whenever I load the form from the dll and show it, I get a weird flicker. It looks like it is the previously used double buffer. Is there any way to clear the background double buffer before the flicker? Or am I going in the wrong direction?
Here's a couple of videos of the problem:
[url]
[url]
Notice the black screen with the white lines on it or the flash of the desktop after I click "Movies." How do I get rid of that?
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Aug 15, 2011
For greater accuracy I should use a Decimal instead of a Double ( so I've been told ). Why then have Microsoft chosen to use DOUBLE for most of the functions that return a floating point value in the Math Class?
[Code]....
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Mar 6, 2010
How can i allow the user to only check one check box on a CheckedListBox1..I was thinking of using a timer but that might be a stupid thing to do.
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Aug 11, 2010
When i use VB6 i get the following outputs
961.605 * 100 = 96161
936.495 * 100 = 93650
929.295 * 100 = 92929
NOW..... When i do the above in vb.net 2005 i get the following
961.605 * 100 = 96160
936.495 * 100 = 93650
929.295 * 100 = 92930
How can i get the same output as the VB results. And i have tired it ! Type conversions, math functions, everything i can think of to get the same VB6 output !
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Nov 1, 2009
I am making a security app. It searches for personal data as email-addresses and IPs, but the code to search for a ip-address is not working right! My scanner should manage to read the ip out of ex:
"ufyukovgjhsui192.168.0.100tyugfk
uyfkj192.163.7ytigfkidf,tygfnhmyu6"
I made this code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Integer = 0
Do Until i = TextBox1.Text.Count
[code]....
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Mar 4, 2011
An error occurred creating the form. See Exception.InnerException for details. The error is: Conversion from string "" to type 'Integer' is not valid."}
[Code]...
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Sep 5, 2010
So, I have a textbox with the following text.
Code:
TITLE"Hello there"
blah blah blah etc...
I want my program to find the TITLE text, and then put the text in the double quotations in a variable.
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May 4, 2012
I am trying to do an if/then to check a textbox for text. I have a form that has name, address, etc. I need to make sure the form has a name in the txtName before it continues on.basically
If txtName has text Then
'continue about your business.
Else
err.message ("you need text.")
end if
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Sep 23, 2010
I have several textboxes trough which i add data in the database. after clicking the save button the data is added to teh database. and if i click again on the ssave button without changing the content of the texbox it adds the same data to the database. i have tryied using textbox.modified but it only works for blank textboxes. how could i prevent from adding the same data?
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Oct 17, 2009
I'm making a program and i want to make it so it checks if the textbox as any text entered at all [code]...
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Feb 25, 2011
I am trying to do an if/then to check a textbox for text. I have a form that has name, address, etc. I need to make sure the form has a name in the txtName before it continues on.
basically
If txtName has text Then
'continue about your business.
Else
err.message ("you need text.")
end if
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Nov 28, 2007
[if me.textbox1.text= system.dbnull then msgbox("please inter a value")] it says system.dbnull can't be used as an expression so how can i check the if the textbox has a null value
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Jan 30, 2010
how many double numbers are in 20 textboxes with numbers that i have.
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Aug 23, 2009
I want to use this code. Is there anyway I can Double quote?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If ComboBox1.Text = "Open Website" Then
[code].....
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Mar 21, 2012
I am working with WMP and trying to change location where my music file starts to play.
timespan += CDbl(((60/BPM) * 4) / _NotesValues.ElementAt(i)) ' creating timespan from collection of notes...
[code].....
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Feb 28, 2012
Ive got a Form application in VB.NET.I have many text boxes on one form (about 20). Is there anyway to check them all at once to see if they are empty instead of writing out a massive line of code to check each one individually such as
If txt1.text = "" Or txt2.text="" Then
msgbox("Please fill in all boxes")
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Nov 13, 2010
How to only check that checkbox which is entered in textbox ? If i have 4 checkboxes eith text checkbox1, checkbox2, checkbox3 and checkbox4 and 1 textbox if i type in textbox 1,2 then only checkbox1 and checkbox2 would be checked again directly after doing that i type 3,4 in textbox then only 3,4 will be checked and 1,2 will be uncheked.. remember i wanna do this coding for unlimited no. of checkboxes .. so dnt provide coding for 4 checkboxes only.
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Apr 12, 2011
I have multiple textbox in a form. How do I know what textbox the cursor currently is? Trying to do something like this:
If TextBox2.Focus() = True Then
MessageBox.Show("its in two")
ElseIf TextBox3.Focus = True Then
MessageBox.Show("its in three")
End If
But I think its not working.
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Oct 4, 2009
I'm trying to check for the number of decimals in a textbox, but I'm not very successful so far:[code]How can I correct my code to make it work? Or any other/better solutions?
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