Use Truncate Function In Column Expression?
Jan 13, 2010i want to set a complex column expression truncate(cdbl(Today()-date2)/30)*(parent(parentchild).field1/parent(parentchild(filed2)))but truncate function is not available !
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Code To Put In An Expression To Add Database Columns In A Row And Display It In The Expression Column
Mar 21, 2010While looking in the dataset designer for a database table I am doing in visual basic 2008 I found a line for expressions under the property menu for a specific column. I need to know the code that I would put in this expression line so that this column adds up the numbers I input into three other columns and displays that number in the column. I need it to automatically calculate this for each row in the database table.
View 13 RepliesDataColumn.Expression: How To Use A User Defined Function In Expression
Oct 12, 2010I am trying to write following expression on a datacolumn. But it results in error:Replicate('*', nLevel) + NameWhere: Replicate() is a user defined function (in a module). nLevel and Name are two other columns in same data table.
View 3 RepliesDatatable Column Expression Error?
Feb 7, 2012I am getting a syntax error " Missing operand after 'Price' operator" with the following code, which should be right but obviously isn't. Any thoughts on where the error is?
table.Columns.Add("ADR Price", GetType(Double))
table.Columns.Add("ORD Price", GetType(Double))
table.Columns.Add("Currency Price", GetType(Double))
[code].....
Possible To Create A Data Column And Using Something Like MIN Expression
Oct 5, 2010Can someone tell me please if it is possible to create a datacolumn(LowestPrice), and using something like MIN expression, have this column (LowestPrice) populated with the lowest amount from 3 columns on the same row.[code]If possible could someone please provide the syntax or code for this to work
View 7 RepliesVS 2010 New Column With A Date Expression
Feb 12, 2011I never thought it would be so complicated to add a few days to a date field as an expression lol...
I have a [addDate] field in my Access Database that the user will put in a number. So if they type 10 then that represents 10 days.
There is preferably a textbox that will display the starting date, this will be bound to another table. (I can make another field with this data, or date/time chooser, etc if necessary).
What I want to do is add a calculated field [newDate] to my datagridview that will add the number of days typed in the [addDate] field to the starting date in the textbox.
I've tried making fields for [originalDate] and [addDate] and tried using [originalDate] + [addDate] as an expression but that give me a debug crash error because the designer won't let me add a system.datetime to anything and if I keep them as strings, they just combine the text, and the date as a double obviously don't work either.
Pass An Expression Into A Function?
Jun 10, 2011I just want to ask if it is possible to create a function that accepts an expression into its arguments. Just like what IIF do. Ex: Dim strResponse as String = IIF(Msgbox("Select Yes or No", vbYesNo) = vbYes, "Yes", "No") I forgot the code, but its the thought that counts.
View 1 RepliesRun Aggregate Function In Expression?
May 9, 20101.print the cars which are fast moving cars.
i have written this code but it shows message Cannot have aggregate function in expression[code]...
Datatable.column Expression To Match Select Sum From Where
Aug 15, 2011I was wondering how i could pass the following SLQ function to my datatable:
Select sum(Quantity) from Purchases where transaction_mode=1
DateTimePicker Incompatible With Column Expression Is SQL Query?
Dec 12, 2011I have DateTimePicker, and when I execute this procedure:
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Me.TextBox1.Text = Me.DateTimePicker1.Value
sqltest = "SELECT * FROM Table " & _
"WHERE TOT_DATE = '" & Me.DateTimePicker1.Text & "'"
datest = New OleDb.OleDbDataAdapter(sqltest, con)
datest.Fill(dstest, "datepickertab")
Me.DataGridView1.DataSource = dstest.Tables(0)
End Sub
Update An Access Database With A Column Which Is An Expression?
Aug 8, 2009I have an access database with several tables. in one of the tables there are three columns named quantity, price and total cost.total cost is an expression of (quantity * price). the expression looks grate in the datagrid etc but when I need to save it to the database
View 1 RepliesUse A Function Both Directly And As A Lambda Expression?
Apr 24, 2012Should I be concerned about the performance of the Compile method here?[code]...
The reason I want the lambda expression is because I want that function to be able to get all the way through LINQ-to-SQL to be converted to SQL. The reason I want the direct version is because I have other code that I want to validate individual serial numbers before submitting changes. And I fear that GetValidSerialNumbers.Contains(serialNumber) will execute a more-complex-than-necesssary query.
Custom Function For Datacolumn.expression Property
Jan 23, 2009i read an article about datacolumn.expression property here [URL]. this is really great. but i was just wondering, for my case i want to use my custom function to use in the expression. basically, on my datatable i added an unbound column AGE. when i display records, i just want the age textbox to be populated with the computation of the person's age based on birthdate.
View 7 RepliesDelegate Function .net : Error Says Expression Expected
Aug 13, 2010Having problem understanding Delegate error. Error says expression expected, How do I fix?Here is the offending line (#259)....
mylist.ForEach(Delegate Function(P As linkItem) As System.Char[] )
Here is the entire code.
<script language="VB" runat="server">
Function sectionTitle(ByRef f As String)
'Open a file for reading
[code]....
Fast Math Expression Evaluator (eval Function)
Mar 16, 2004I 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 RepliesHow To Implement Truncate To A Row
Jun 22, 2010[TEX]Hello[/TEX] How do i use truncate in vb 2008?my database its in Access and i want to implement a truncate table in vb but i don't know how to do it.
View 1 RepliesHow To Truncate An Array
Sep 3, 2009is there a simple way to truncate an array ? Something like placing an end characted in the array which would signify its end ?
Basically I have two arrays of slightly different sizes and I want to shorten them so they both have the same size. The end data I am truncating I don't need.
Truncate String Value To 17 Characters Only?
May 19, 2010how to truncate my string value to 17 characters only.
in my program, the acceptable number of characters for First Name is 17. Characters more than 17 should be truncated but it may cut words in the middle. I need to make the length max 17 characters, but, if it cuts a word, it should also remove this half-word completely.
Truncate The Beginning Of A Log File In .NET?
Feb 24, 2010I have an VB.NET app that writes the status to a log file in text format. Over time, the file is getting large and I wanted to know if there is an efficient way to truncate the beginning of the file.
To make things easier, I am looking to specify a file size (say 2-3 mb) and I am writing the log using a StreamWriter:
Using strm As New IO.StreamWriter(filelocation.log, True)
strm.WriteLine("msg to write")
strm.Close()
End Using
I thought about using the strm.BaseStream.Length to determine how much of the file to cut off, but by using the .SetLength it would cut from the end - not the desired result.
VS 2008 : Don't Use Int() To Truncate Numbers
Oct 4, 2009I've been using it and even saw a method in a MSDN search given that suggests that it should be used but have found that there are defects using it. An example of problem occurring.
Dim db As Double
db = Int(10.12 * 100) / 100
db should be equal to 10.12 but the result you get will be 10.11. In the above example nothing is being truncated. If you added some digits right of the 2 it would give a good result. But if you're using a variable and it sometimes is equal to 10.12 or 9.12 etc. then a problem would occur. Also if 10.12 was replaced with 10.03 you'd get a result of 10.02. 10.04 gives a result of 10.03. 10.2 gives a result of 10.19. I'm now using code such as what is seen below instead of using Int() :
bd = Decimal.Truncate(CDec(10.12 * 100)) / 100
You could declare bd as a Decimal and then you wouldn't have to use CDec(). If I try Int(1012) the result is 1012 but Int(10.12 * 100) will give 1011. Pretty weird in my opinion.
Error : "You Have Tried To Execute A Query That Does Not Include The Spec Ified Expression 'ID' As A Part Of The Aggregate Function
Jul 1, 2009I am working on an application in Visual Basic Express using an Access 2000 database.I am trying to get athe following SQL query to work but get an error in Access.
The query is:
SELECT [ID], [Title], [Author], [Series], [YearPublished], [ISBN], [CoverPrice], [Style], [Condition], [Signed], [Comments], Count([Title]) AS CountOfBooks, Sum([CoverPrice]) AS TotalCoverPrice
FROM tblBooks
WHERE ID=[@ID];
The error is:"You have tried to execute a query that does not include the spec ified expression 'ID' as a part of the aggragate function."
The query works fine without the 'Count' and 'CoverPrice' count and sum to the query.
Truncate DateTime Variable E.g. To Minutes
May 3, 2009How can I "truncate" a DateTime variable so that only e.g. the current minute remains?
Like in:
Dim myDateTime As DateTime
myDateTime = Now
.... (what would have to come here)
If Now is e.g. 15:43:21 then leave only 15:43:00 in the variable?
Truncate SelectedItem Text In ComboBox
Feb 25, 2008I've been trying to find a solution to this problem all morning.This is what I have: 1 comboBox control,autofilled from SQL table [code]...
View 6 RepliesTruncate Table In Sql 2005 By .net Code?
Jun 2, 2009well i am truing 2 make a button when i click it would truncate the data in table , i am trying 2 do this by vb.net 2005.
View 5 RepliesVS 2010 Truncate Lines In .txt File?
May 2, 2011Im trying to truncate lines in a .txt file from 19chars to 13chars. Then copy the .txt file to another location and rename the extension to .lst. As below... Iam having issue with getting it to write the truncated number to the new txt file. Its some how returning a Null referance & i cant work out why??
Imports System.IO
Public Class Form1
Sub ProcessFile(ByVal SourceFile As String, ByVal DestFile As String)
[code].....
[2008] Truncate Tabs Text?
Mar 5, 2009Using tabs for my web browser, I noticed (since im using documenttitle to populate the tab text) if a site has a long title, it will extend my tab var far, how can i limit this to a certain amount of text?
tab text code it:
TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle
Loop Does Not Truncate Into A Two Decimal Place Holder
Feb 14, 2012I wrote a loop that posted an accrued principal cycle to a listbox for a period of 10 years (10 loop cycles). The problem is: not only does the amount of the principal reconfigure for each loop cycle, but it does not truncate into a two decimal place holder as it should. I would like to use the ("F2") but I am not sure where to put it within the code. Here is what I have for the Calculate button event handler.
[Code]...
VS 2010 Truncate Charachters HEX Data Stream (Serial)?
Sep 4, 2010The RX data from the serial port is as follows:
FE FE FA E0 00 23 45 FD
I need to truncate everything else and just have positions 5, 6 and 7 output in the hex in a TEXTBOX. See below:
452300
Instead it will put the the whole steam in the textbox and it will be in decimal format, not hex.
DataColumn.Expression Count - Filter On The Day, Count The Rows And Then Populate This Added Column With The Result?
Nov 2, 2010I have added a column to a Datatable called CallsPerDay which is there to tell me how many telephone calls have been made on a particular day or days.Is there a datacolumn.expression which will allow me to Filter on the day, count the rows and then populate this added column with the result.
View 1 RepliesCall A Dynamic Compiled Func(of ) Function Via Expression.Call?
Mar 22, 2012I want to create an ExpressionTree where a Func(of Vector, Vector, Vector, Vector, Double, Double, Vektor) should be called. So I use
Expression.Call(Forces(0).Function.Method, {Vec1, Vec2, Vec3, Vec4, Double1, Double2})(Vec1-4, Double1-2 are declared as ParameterExpression and Forces(0).Function as Func(of Vector, Vector, Vector, Vector, Double, Double, Vector). But I get an AgrumentException, because Forces(0).Function.Method has seven Arguments. (System.Runtime.CompilerServices.Closure as seventh argument at Index 0).