Is there any way to parse a string in vb.net (like, built in methods), that can do math like Eval can? For example, 3+(7/3.5) as a string would return 2.
I am not asking for you to code this for me, I just want to know if there is a built in way to do this, if there is not I will code it myself.
I can wager that it would not be able to parse stuff like Sin(90) on its own, and I understand that would need to be replaced by Math.Sin(90).
I need to execute scripted text formulas. I believe that in VB 6 and/or VBA there was a method EVAL() that did the job, eg: [Code] As it seems, such a method does not exist in VB.NET. [url] The method works fine but due to its comprehensive layout its not that fast (as i need to call it myriad of times) Does anyone have a SIMPLE, FAST, straight forward math expression method? Or anyone knows how to use the old EVAL method in VB.NET?
View 10 RepliesI want to execute the code that is passed as a string to my function, the code will be passed at runtime. This is an example code that may be passed as a string to my function. p is a dataset, which is declared and has some values, this code is executed in a asp.net page
p.Tables(0).Rows(0)("disp_status") = "Approved by CEO";
p.Tables(0).Rows(0)("status") = "Approved";
Session("fnc") = "generate po";
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well i am having a couple of issues with this particular homework problem and this is my first programming class so there is probably quite a few mistakes well the homework problem is to take three double values entered by a user and display the largest and smallest using math.max and math.min and display the smallest and largest so i thought i could use a listbox and take the values that went to the listbox and assign variables to each so i can try to use each variable in the math.max and min but im not making it to far and i actually might be way off
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This is my .aspx page code: -
<asp:Button ID="btnProcess" runat="server" Text="Place" OnClick="btnProcess_Click"
CommandArgument='<%# Eval("intId") & "~" & Eval("IdECompleted") & "~" & Eval("dtECompletion") & "~" & Eval("strName") & " " & Eval("strCode") & " " & [code]....
I want to use it like below but gets error: -
Private Sub Grd_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles Grd.RowDataBound
If Session("poweradmin") = True Then[code].....
I only want to show the credit card info section if the Eval expression evaluates to true, but it gives me and error saying I can only use it in the context of a databinding control, I know I have to put the #, but vb then says that I must use If() or IIF(). What is the correct syntax.
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I'm trying to bind an image using Eval() with VB.NET and ASP.NET, but am running into issues:
Code snippet
<bri:ThumbViewer Id="Th1" runat="server"
ImageUrl='<%# Eval("Name", "~/SiteImages/ram/3/{0}") %>'
Height="100px"
[Code].....
Ok so if you look at the markup of this page: [URL]
You'll see that it uses eval and unescape to make it look like this in it's markup "%73%65%6c%66%2e%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%6c and so on...."
I'm trying to make a program using httpwebrequest that will grab this long string off the website using regex then decode this and put it in a textbox. I know how to accomplish the first two parts how I could decode this in VB.
I have a SQLDataSource that is bound to a ListView control but I want to place parts of the bound record into the HTML TITLE attribute. Here is my codebehind file that I want to change so it can use Eval to construct a dynamic TITLE based on the data content[code]...
View 1 RepliesI am working on my first project with the Entity Framework and am having some difficulty displaying advanced information with the EntityDataSource and a ListView.
For example, given the two entities:
Item
Name
[code].....
I've written a piece of software which extracts information from the web and stores it all to a local SQL Server database which all works well. However, I now want to add additional functionality where any user can go in and create a template which would be run when every synch has complete which would save as an HTML file. I've set up whole thing. Information is stored in a backend XML file which is processed when the synch completes. However, I want this information to check delimeters in the string and process it as code.
View 2 RepliesI have a repeater which takes 270 seconds to render and actually ends up crashing all browsers. The SQL to retrieve the data takes about 10 seconds. I wanted to remove the Eval's to see if that speeds up things a bit, but I am having trouble with the correct syntax. I have doubts that this would actually improve performance as I am dealing with 150,000 records. Would a GridView or other control be faster? Would using LINQ to SQL improve performance? Here is the code for the Eval:
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can i save the returning value of eval function in a variable and use it wherever i want? i can call it just in <asp: .... tags. i can't use them in vb methods. is it possible?
View 1 Replies<%If (Eval("NewPrice")) =0 Then%>
<% Session("OrigenalPrice") = True%>
<asp:Label ID="Pricelabel" runat="server" Text='<%# Eval("Price") %>' />
<%Else%>
[code].....
I can bind a inner object property to gridview using the following setup at design time in an ASP.NET gridview
<asp:TemplateField HeaderText="ObjectName" >
<ItemTemplate>
<%# Eval("Object.property")%>
</ItemTemplate>
</asp:TemplateField>
but what I would like to do know is create this programatically at runtime
i.e. define my columns, add them to the gridview and then databind
has anyone done this or have any pointers??
I have written a web usercontrol (ascx). Inside, there is a Panel that I want to show/hide on click of a hyperlink inside the usercontrol. Normally, this is easy just by doing something like this (the onclick attribute is added to the hyperlink on prerender):
[Code]...
this its a very silly problem i have with CheckBoxList control, i dont know if its just me or what but the whole idea of the control its just great but the implementation its very confusing.
im trying to eval something like this
if CheckBoxList.Items.Item(CheckBoxList.Items.Count-1).Checked=true then.....
or something like
CheckBoxList.CheckedItems.Item(CheckBoxList.Items.Count-1) = Checked then...
the problem its that i dont know how does the checkboxlist works but it just sucks that they had to make it so confuising....
i've handled lots and lots of collection controls and they all work in a similar and simple
I,m developing a debt calculation program 'my problem is when i have to calculate the months to pay back the debt it comes to 28.04 and i have to get it to 29 my code looks like this:
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How can I round 4.39 to 5 in VB.NET? I tried:
Math.Round(4.39, 0)
But it displays 4.
I am trying to perform a simple multiplication in vb.
Below is my code:
Dim minus As Integer
Dim minusPrice As Integer
Dim totalPrice As Integer
[Code].....
I've been having a problem with Math.Log in a function I'm trying to write. When working with variables, it always returns 0. Here's the line I'm trying to run:
Quote:
mb = txtMb.Text
k = txtK.Text
t = txtT.Text
[Code].....
I am trying to use Math.round. now my math.round (2.5) converting it to 2. O want to convert it to 3.
View 6 RepliesI am trying to do math (-, +, *, etc) based on what a user selects from a combo box. The combo has the operators (-, +, *, /) in its items list. when the user selects one of them, I want to use that operator with the two numbers the user also provides from two text boxes.
dim intNumOne as integer
dim intNumTwo as integer
dim intAnswer as integer
[Code]....
'I don't think I want to concatenate here. but this is what I would like to happen (use the operator based on the users selection from the combo and the two numbers from the text boxes. I know I could write a select case or If statement but is there a way to do what I'm trying to do without Select Case or If? I tried to make theOperator a 'char' type variable but that didn't work either.
I have tried following coding to get highest value.EX: If I type 4.341111111111, It should get the value 4.35. If I type 9.132222, It should be 9.14 not 9.13.[code]
View 9 RepliesI am building a tool to figure out final value fees. This is the math i have to try to code
$1,000.01 or more 8.75% of the initial $50.00, plus 4.0% of the next $50.01 - $1,000.00, plus 2.0% of the remaining final sale price balance ($1,000.01 - final sale price)
I'm using .Net 3.51 SP1. I've been having problems with .Net's inability to add single numbers, could anyone throw some light on this.
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I am trying to create a small application which does mathematical calculations using dates and times. Specifically, to determine the period of time between two specific dates and times.
View 2 RepliesI have a strange result coming from some big math & have no clue as to why I'm getting a different answer from vb.net vs python.Here are the quick snippets & results:
VB.NET
Dim MSB As UInt32 = 3067297518
Dim LSB As UInt32 = 1439785590
[code]......
I've a problem using simple logarithm function Log in some ButtonClick Event. Log is underlined with next warning:System.Diagnostics.Log is not accessible in this context because it is Friend.
Have I missed something or this happens because of the Express version of Visual Basic?
1. The lens equation for a camera is 1/f=1/di+1/de , where f is the focal length of the lens, is the distance between the lens and the film, and is the distance between the lens and the object. For a certain camera, an object that is 18 cm from the lens is in focus when the lens is 9 cm from the film. What is the focal length of the lens?
View 1 Replies