How would I implement a simple low pass filter in VB.NET? I have a byte array of 8-bit sound values sampled at 44.1 KHz and I would like to apply a crude and simple low pass filter that starts to roll off around 2.5 KHz. Nothing fancy - I'm not expecting lots of dBs per octave, just something to slightly reduce unwanted HF components. When I Google this all I seem to find are complex FFTs and other functions derived from electronics design packages that are way beyond my math to have any chance of adapting them for VB.NET.
I have tried some very crude averaging: take sample 0 and sample 2, average them and put the result in sample 1. It sort of works but is probably a bit too crude.
I'm develloping a small application over na Access 2007 database. how can i pass the value of a combobox to a query being built with the query builder tool?If I use ? in the Filter column I�m prompted to enter the value but what I need is to pass the value of a combobox in a form. I tried to use:
HTML =MyForm.MycomboBox.Value
but it is ignored, interpreted as the value to be filtered.
I`m looking for a way to parse a parameter name like linq does.I want to filter before i download the date from the database.With LINQ the data is already red into a dataset. I only want to select data from the database witch i need. how i can send a property name to a function without using the property name as string and without to use to mutch code inside the function and without creating an instance of the object, etc.
I've been trying to add a database to my interface, and i can't seem to filter the data, i want to search based on last name and only display people with the that last name (the last name will be entered in a search form).I've tried writing SQL Queries but I can't seem to pass the variable that that holds the last name into the SQL Query, to filter the data.
I have a text file where the second column is numeric fields. All I'm trying to do is only show rows where the field in column 2 is in between txtmin.text and txtmax.text.The strange thing is that the following coding works.[code]
Kinda new to working with wpf apps (and vb.net). Looking for a way to filter a datagrid using a combobox (to select the field that the user wishes to search) textbox (to input search terms for specific records). The datagrid loads fine as does the combo containing the fields, however my filter simply does not work.
Code for loading data (works fine) Dim obj = Me._dataManager.Collections.ReturnCollectionByID(tableSelectionCombo.SelectedItem.TableID) Me.DataGrid.ItemsSource = obj obj.Load(New DataManagementDataRequest(Nothing, Nothing))
Code for filtering (not working) If Me.searchTxt.Text IsNot Nothing Then obj.filter = selectFieldCombo.SelectedItem.ToString Like searchTxt.Text.ToString Else obj.filter = "" End If
I have a datagridview where I have added a filter. What I am trying to do if the user leaves the field blank I want all the records to show. The field I am filtering on is an integer. I thought I could declare a variable and if the field is blank include all records greater than 0. This would return all records as the number will never be below 0. I tried this but can't get it to work:
HTML If txtFiltID.Text = "" Then sSerialID > 0 Else sSerialID = txtFiltID.Text End If 'Refresh dgv on filtered criteria Me.VJobLinesTableAdapter.FillByFilter(Me.DsJobs.vJobLines, sSerialNo) It works fine if the user enters a value.
I am using vb.net express version. I have a datagridview which is popuated with data from an access database. I have all the data side working ok with the "Call Date" column set as datetime and sorted in date order assending within my application. I also have a monthviewcalender on the form and wish to filter the datagridview by the date selected in the monthviewcalender to show appointments i may have on that date.I have tried to populate the selected date into a textbox and use the following to filter:
AppointmentsBindingSource.Filter = String.Format("[Call Date] Like '" & TextBoxDate.Text) & "*'"
This causes a error. I have tried many different variants like:
AppointmentsBindingSource.Filter = ("[Call Date] Like '" & MonthCalendar1.SelectionRange.Start) & "*'"
The column is set as datetime in access and is system.datetime in the database explorers properties.
I have a datagridview and im using this code fill the table from a txt file.
Private Sub PopulateDataGridViewFromTXT(ByVal SFileName As String) 'Variables to store the count of rows and columns Dim nRows As Long
[code]....
All that long list(more than 2000items) is loaded into my datagridview which have two columns named "ITEM" and "ID" With the code above the item from the id is splitted to each seperate column.I want to press a button and filter the table to show only swords for example or only spears.And the other thing is to make a search button to search for a specific item,which i suppose if the first thing is doable the second will be peace of cake..
I'm using bindingsource.filter to filter data in my datagridview as the query from the datasource (JD Edwards) is being loaded the REQUIRED column is being converted from julian date to georgian date.everything works fine the date is converted and is visible in the datagridview as a short date string.However when i run the filter it wont work unless i manually select a row (it can be any row, but only one row) in the datagridview, then the filter will work.Me.testBindingSource.Filter = "REQUIRED = '" & DateTimePicker1.Text & "'" is the filter. The odd thing is ive used this exact filter before and never had this behavior, i'm stumped.
am new to vb 2010 i havent touch VB since 2002 , am a lil confuse how to make things to work now.i have a local database "sql" with 2 tables.one holds the client info and the other the orders for the clients.i have a data grid view and am able to populate the grid with the correct information for the client. using [code]that brigs me all the orders for that client.now orders are also made by campaing.i have a textbox that the user will type the campaing to view just the orders for that campaing beloning to that clientand i get stuck,what i get is all the orders from that campaing and the 1st filter by client gets override.
I want to enter records into an sql database but before i do so i would like to load data from the sql database to a dataset and test if the record i want to enter is already in the database. if yes it does not add the record - preventing duplicated records...for examplename | grade | subjectleo | 7A | mathsi knw how to load the database to a dataset but cant rap my mind around the test to see if the record is already there..
I am trying to pull data that falls between two dates: I have a dataset that has the following SQL. This I have on my form as a DataGridView. I then have two DTPs that the user would use to select start and end dates.
SELECT JobNumber , DeliveryDate FROM vJobs WHERE (DeliveryDate BETWEEN ? AND ?)
When clicking a filter button I have the following code that refreshes the dataset and DataGridView
I have an array of filenames and I would like them to be filtered depending on a string variable. An example: If my filter was *.txt, then I would like to only display files with the .txt extension. *.* (All files) *asc.* (Files that have asc in them (and any other data before asc) So on and so on. Just like popular search programs. What is the easiest way to do this?
This is my first time posting and I am asking for a huge favor:I have a web browsing application that is supposed to filter bad words. I know:WebBrowser1.DocumentText = WebBrowser1.DocumentText.Replace("BADWORD", "B******")Does NOT work. I know that you can litterally cut some text from a web page using:
WebBrowser1.Document.ExecCommand("Cut", False, vbNull)So, maybe cut and replace the word?
I am trying to filter the results of a datagridviw using the bindingsource.filter method.
Dim filters(2) As String ... If Me.txtPartIDFilter.Text = "" Then
[code]....
The issue is in the last line. ID_Part is an Int64 data type filters(0) is a string so the system returns a "Can't perform 'Like' operation on System.Int64 and System.String" error message.As you can see I tried converting the data type, but that failed since it is encased in String.Format()- it's going to be a string no matter what, I suppose.It's almost 1:00 a.m. so I'm not firing on all cylinders.
I have started a form application using visual studio 2010 express, vb programming. I'm using Access as my database.My goal is to have ComboBox1 display a ProjectID and ComboBox2 display a TestNumber. Once the Test Number is selected I want my textboxes in the form to display fields from the row that the selected Test Number is in.I have 2 tables set up right now "Projects" and "TestData". The "Projects" table has a [ProjectID] field, the remaining fields are just misc. project data. The "TestData" table also has the [ProjectID] field, and then the [TestNumber] field, then the remaining fields are misc. data.
Filling [ProjectID] in textbox1 is easy, in the properties I select DataSource from the Projects table, display [ProjectID] field. Where I'm having troubles is ComboBox2 displaying the TestNumber from the other "TestData" table. If I select that field, it fills the ComboBox with EVERY TestNumber there is. So for Project 1 there is a test 1... over 500 projects, that combobox lists 500 Test 1's, no way to tell what project it belongs to...How do I make ComboBox2 only display Test Numbers that pertain to the Project number selected in ComboBox1?Using this code I can get it to work:
Dim ProjectNo, SQLString As String Dim dtTableData As New DataTable() Dim dbDataAdapter As OleDbDataAdapter
[code]....
I also imported system.data.oledb Problem with this code is it will only filter data in ComboBox 2 but when you make your selection from ComboBox2 it won't activate the row so none of my databinding textboxes fill anymore. Before the code/query is ran it fills up the textboxes perfectly after every selection I just have no idea what project that report number belongs to because the whole field is displayed in the dropdown. I can fill the form with ComboBoxes and they display the corresponding row data because I use a "datasource" instead of textbox "databindings" but I don't want to use 20 comboboxes as my entry form...
i would like to filter a datagrid thats bound.i have the value as string 11/2010 wich is datevalue [code]i want to filter the dates that contain "11/2010" this value.obviously the result will be
I am working on an app where a user can do various calculations for a number of different tasks, each task has its own unique Item ID.The calculations are done in dgv's and all calculations get captured in the one datatable.I wanted to filter the datatable based on multiple criteria, if possible, and bind it to the dgv so that the user is only working on the calculations pertaining to that particular task.From what I have read, a bindingsource would allow me to filter my data in this way.In the code below, I have binding source that I am trying to filter and then present that filtered view in a datagridview.I keep getting a syntax error at the bindingsource.filter line that says Syntax error: Missing operand after 'ID' operator.It's the first time I have tried this and I don't know what is causing it
I am pulling data from a SQL server database into a dataset. The date are a DateTime type:
[Code]...
I can see the data in the field reads: 2011-09-09 15:56:29.667. I have tried to convert this by adding convert(varchar(10),DateFrom,103) which results in 09/09/2011 and then Custom Formated the DateTimePicker but still no success.I think I might be going completely off track here so can someone guide me on where I am going wrong here or the best way of doing this
how to turn off the filter that is on the Add Reference form ? Its on the .Net tab, and then it says "Filtered to: .Net Framework 4 Client Profile". So all my references are not filtered alphabetically. Really annoying.
I'm making a simple HEX Editor with VB 2010. As a result I am trying to automatically leave a DataGridView cell after entering two characters and move onto the next cell
I am trying to create a simple browser that will be mainly for personal use. I followed a tutorial to create the actual browser; the address bar and the Go button and now I need to create the Home button, Back and Forward button.If I can find the source code for it, I am going to implement it into my sample browser and perhaps?
