I am trying to check this app. and make sure only numbers are placed into the textbox, but my tryparse isn't working.
Private Sub btnConvertC_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConvertC.Click
Dim intTemp As Integer 'holds the text input
If Integer.TryParse(txtTemp.Text, intTemp) Then
[code].....
I have an array of 5 objects and also 5 textboxes. I am wanting to check to see if the values in the corresponding textbox are valid for the type of object.I have currently hard coded this, I parse out the object type and then use a tryparse statement depending on the object type.
Can I do this automatically? Can I detect the type and use a tryparse statement for that type. Maybe something like:if objectarray(x).tryparse(textbox(x).text, nothing)
I have become accustomed to using TryParse for attempting to parse unknown types:
Dim b As Boolean
Dim qVal As Boolean = If(Boolean.TryParse(Request.QueryString("q").Trim(), b), b, False)
or
bool b;
bool qVal = (Boolean.TryParse(Request.QueryString("q").Trim(), out b) ? b : false;
So, just curious if someone knows a better way of doing this other than using a ternary operator.
public static class PrimitiveType
{
/// This function will return a parsed value of the generic type specified.
/// </summary>
[code]....
Just pass in the type you're expecting as the generic and provide a string value to be parsed and a default value in case the string is not parsable. If you provide a class instead of a primitive type it will throw new ArgumentException("Generic type must be a valid Value Type that has a Parse method.");
The adultcombobox & childcombobox have value from 1 to 10, and none.I try put it in Do Loop like the code below, but the total price not come up so well, so I think I am having problem with the Do Loop and the Payment method.One more thing, do I need to Tryparse the combobox and use the selectedIndex ?
[Code]...
I am in my programming class and we had a small program to make that would check to see if an value that was entered is a integer and convert it to a Roman numeral. I know how to properly do it by putting the TryParse into the If...Then statement. What I am trying to do is to not use an If...Then statement and go just by a Case Selection statement. If it is not possible then that is cool with me, I am just trying to think outside the box. Here is what i have done with it:
[code]....
When you do say "Case 1" it says it needs to be "Case CBool(1)." Using either "Case CBool(1)" or "Case 1 = 1" provides the same result .However the code shows no errors it doesn't do the conversion, it always displays the label's value as "I"
this is for homework but I have 90% of the project done, I just need to finish the data validation portion of the code. This is what I have for the calculate click event:
[Code]...
this is for homework but I have 90% of the project done, I just need to finish the data validation portion of the code.This is what I have for the calculate click event:
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
Dim intInputA As Integer
Dim intInputB As Integer
Dim intInputC As Integer
[code]....
My Problem: I am using the Try parse to validate weather the inputA(B)(C) is an integer or not, if it is an integer, i want it to move to the nested if and validate that it is a positive number, and show the error message in the label if it is not. If it is not a number at all i want it to show another message in the label. The problem that I am getting is that even if i put in a letter for the input it does not catch it and it continues on to the select case, which comes out 0.
My understanding of the Integer.TryParse() function was that it tried to parse an integer from the passed in string and if the parse failed the result integer would remain as it did before.
I have an integer with a default value of -1 which I would like to remain at -1 if the parse fails. However the Integer.TryParse() function on failing to parse is changing this default value to zero.
Dim defaultValue As Integer = -1
Dim parseSuccess As Boolean = Integer.TryParse("", defaultValue)
Debug.Print("defaultValue {0}", defaultValue)
Debug.Print("parseSuccess {0}", parseSuccess)
[Code]....
On all my assignments I am asked to make sure the data is valid - only numeric, no empty strings. And I keep wondering which is the best to use IsNumeric or TryParse. When I try both on coding they seem to do the same thing, and I don't seem to find my answer online. Any ideas of why to use one over the other.
View 3 RepliesI am creating a program that will convert Celsius to Fahrenheit and visa versa. The program must use a function to return the answer. I'm using a string function that will return either the temperature in Celsius or Fahrenheit or "Please enter a valid temperature" if anything but a number is entered. TryParse is used to check if the input is valid.
When using the TryParse method in the function I am trying to use a parameter to pass the variable that will store the converted data type value [Code] The line " If Double.TryParse(tempTextBox.Text, scale) Then " is supposed to check if the conversion is possible and if it is pass either F or C as a variable to the scale parameter. It seems to verify the conversion all right but it doesn't actually do the conversion. Why isn't doing the conversion? Both F and C remain 0. I can get it to work by using two more TryParse methods (one in each branch of the If else statement in the function), but I'd rather not do this.
With a Decimal, I use:
document.Air1 = CDec(IIf(Decimal.TryParse(Air1TextBox.Text, Nothing), Air1TextBox.Text, "0")) to fill the column with there is no value.
I would like to do something similar when the date is blank (preferably with NULL or just plain blank):
document.TestDate1 = CDate(IIf(Date.TryParse(TestDate1TextBox.Text, Nothing), TestDate1TextBox.Text, " - - ")) - of course, this throws an exception.
The table Data Type is date.
Is there any way to use the TryParse method to check for letter text input?For example, a user needs to input a name in a text box. Is there anyway to check that input are all letters?
View 4 RepliesThe code performs correctly when the input is an integer, but when I enter a character, the result is as though I've entered an integer. Can you tell me what's wrong with my TryParse statement?
Private Sub btnCompare_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompare.Click
' Declare Local Variables
[CODE]...
How would I code a TryParse to get the input from customer from a textbox named Strands and convert it to a number (this number will always be a whole complete number, cannot be 5.6 or 4 1/2 or whatever) then have that Strand number be muliplied by the selected item in my listbox1. This listbox has an access database bound to it with 2 columns Size and Area, the Size equals the Area and I set the Value to the Area column but set the Size to show up in the list box. and the Strands textbox has to muliply by the Size picked, but by the Area # not the Size #. And the results of that multiplication showing up in another textbox named total.
View 14 RepliesI have a TextBox in a Windows Forms application in VB 2008 (.NET 3.5) where a user can key an estimate amount. I am allowing them to key dollars and cents, and I want to round to the nearest dollar. The original code had the rounding down when the data was written back to a table, and that worked fine - I have this code in a "Save" routine that fires when the user moves to a different screen or record:
Dim est As Decimal : Decimal.TryParse(txtEstimateAmount.Text.Trim, est)
Dim estimatedAmount As Integer = Math.Round(est)
I decided that it might be nice to actually do the rounding as soon as they leave the field instead, so they're not surprised when they reload the screen and find that 1822.60 is now 1823. So I took the exact same code and added it to the TextBox.Leave event handler. And the weirdest thing happened: instead of the variable est being populated with 1822.60 after the parse, it gets set to -1! What the...?
Debugging the handler shows that the value goes into the parser correctly, and if I do the parsing manually via the Immediate window, it parses correctly, but when I let the code do it, it invariably gets set to -1. What's even weirder is that any number gets parsed as -1, not just decimals, and any non-number gets parsed as 0 (which is correct).
Has anybody else ever run into this before? I tried moving the code to the TextBox.LostFocus event instead, but with the same results. I have no idea what in the heck is going on, and obviously there are workarounds galore for this, but it just makes no sense whatsoever.
EDIT: Here's the full event handler (current behavior for which is to put -1 in the TextBox):
Private Sub txtEstimateAmount_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtEstimateAmount.Leave
' Take any dollars-and-cents amount and round to the nearest dollar
Dim est As Decimal
[code]....
I have string that contains "1.3" and I am checking with Date.TryParse method. It automatically converting into "1/3/2010". How to handle this?
View 1 RepliesI used this quite frequently, but could never define its role
View 5 RepliesI have Tried to convert "1" to integer using Tryparse it showed true but when I used it on "1.00" it is showing it as false, why?
View 1 RepliesI have a property which is an array of items but when I come to add an item to the array it says I must use the new keyword, but I can't use a new keyboard with a property.
(item is a custom class)
Private itemsvalue As item()
Public Property Items() As item()
Get
[Code].....
how I can add the xx item to the array of items.
Theres no error that is stroked with red but when i try draging a icon i just dont work ::(
heres the code:
Imports System.Runtime.InteropServices
Imports System.IO
Public Class Form1
Public rowz = 50
[code].....
I have a form that is first displayed as 425 x 66. When you press a button, the form expands to 425 x 398 and a message appears (a label prooperty) with the text: Processing Files. When the files are finished prosessing, a listbox appears and summarizes which records were added to the database.
The label begins as Not Visible. After I change the size of the form, I change the label property to Visible.
This used to work, but now, for some reason, the text simply doesn't appear.
I tried changing the lblproperty to Visible at startup but when I do this I get a black bar where my lable should appear.
I've migrated a VB6 Windows based system into VB.NET (version 2008) thru the use of wizard. I'm able to run the program and generate ralated reports at the development PC BUT when I installed it on a server, the system seems not runing at all (no report being generated) and without any error. I tried to install it at another 2 different servers and having the same result...no report being generated and without any error.When I installed it at a PC (NOT server), the system able to generate reports.
[Code]...
I am trying to add a Handler, but it do not work. what am I missing? I getting this error.
Dim EditingTextBox As New TextBox
Dim Save_Button As New Button
Dim Cancel_Button As New Button
Private Sub Labels_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
[code]....
I have a form with several listviews. 1 master with two columns and 10 other all with two columns. I have been able to do a drop from 1 to the others and among the others. I want to move the second column around also. I can't read the subite.
[Code]...
I'm passing some values to another site to get the values from it.below mentioned is the code which I used in VB.NET
Dim status As
String
Dim strHTML As String
Dim xml = xml.open("GET", "http://www.xyz.com", True)
xml.send()
[Code]...
I'm running a 32-bit vista home, and I'm trying to instal Visual Basic 6.0 Enterprise Edition, but I seem to be having problems.
View 1 RepliesI am developing a project that is dealing with CCTV camera made in china. I am provided by some DLLs from the company. Now i want to consume that dll into my application. I have tried default Visual studio's ADD REFERENCE features. then I have tried tlbimp.exe but it doesn't work.[URL]..I have search a lot about dll, some says "Check the dll header" and CLI Header. I opened this fine in notepad and I found only like "This will not work in DOS mode...". what to do next. Is there any way I can consume this file in .net.
I have already tried to add it as reference in Visual Studio 6.0 VB. even it says this is not a valis library.
Still dumpbin.exe is listing the function inside that dll.
I am confused about this scenario. Please guide me what to do with thi.
I am trying to create a Windows Forms control in VB.Net to wrap around a control in an old DLL I created in VC++ 6. I am trying to make a call to an API entry in my control:
Code:
<DllImport("myctrl.dll")> _
Protected Shared Function InitMyControl() As Boolean
End Function
However, when I add a call to InitMyControl to my control's code and try to load the form on the test project, the following error shows up:
Quote:
Unable to load DLL 'myctrl.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
I have tried putting a copy of myctrl.dll into the Debug and Release folders of both the control library and the test project, but I continue to get the error. I even copied it to my WindowsSystem32 folder, but still no luck.
I have a program that I have written using 2005 and .Net Framework 2 SP2. I went ahead and created the snk file placed it in a shared folder on the same server that I will be running the app from. In my AssemblyInfo file I added point to where the snk file is located as follows.
View 7 RepliesI have a problem on sending sms which it only send only one letter to the receiver. For example, I have sent the word "Hello" and the receiver only receive "H". I am using the serial port to send the sms.[code]....
View 11 Replies