19,729 Topics
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| | i want to Autogenerate id column in my database table , my code is given below . it is not workin it is giving me Exception as "startIndex Cannot be larger than Length of string , parameter:startIndex ".how should i solve it Private Sub AutoGenerateNo() Dim no As String Try …  |
| | Hello, I'm very new to using VB.Net so I found it quite difficult to understand other answers that I searched for. Basically, I have an project to develop where a user can create an account, and log in with it. So far I have : Created a database in ms … |
| | I have a barcode scanner. So when the barcode is scanned using a gun, the value normally is entered to textfield placed on the screen. So I have made an excel macro. And when the barcode is scanned, the text appears on the cell ending with the new line character … |
| | Sub filllist() strsql = "select * from tabletest" ListView1.Items.Clear() sqlcmd.CommandText = strsql sqlcmd.Connection = sqlconn sqldr = sqlcmd.ExecuteReader() [B] sqlda.SelectCommand = sqlcmd -- the error is pointing here and it say NullReferenceException was handled then Object reference not set to an instance of an object. How do i solve this? … |
| | Hello, I've recently created a vb.net windows form application which i user the background worker component in it, Now i'm trying to do the the same for smart devices in C#.NET or VB.NET, how to do threading in smart devices , what i basically wanna do is start a loop … |
| | I have a data table with query inside, then i need to sent value of data table exactly in datagridview i made before. Anyone can do this?:-/ |
| | Is there any way of running and compiling with known errors in the code. Her is my reason. I am using a reference to word 2008 and word 2010, so as the program will work with both versions. Trouble is that if the computer I am using to test the …  |
 | hey guys i need some help on table values for example i have a table for books and it has two fields one is number of Copies and Number of Borrowed how do i subtract and add values to each fields for every single transaction on the same table? |
| | Can you give me some codes of how to make a Online Grading Enquiry System using visual basic. i need your help sir beacause this is uour project. hope can you help me |
 | In my project, I have two seperate forms and in one of them I can add various panels using a button. After adding let's say 5 panels I click on one of them and I need the code to tell me which panelI clicked on. The reason I need this … |
 | I used this code to retrive from one record to another first tried to retrive the first record................. varible decalaration Imports System.Data Imports System.Data.SqlClient Public Class Form3 ' Dim connectionstring As String = Module1.connectionString Dim sqlconn As New SqlConnection(connectionstring) Public sqlDataset As New DataSet Dim da1 As OleDb.OleDbDataAdapter Dim myCommand1 … |
| | Hello everyone... I love the magic that programming does, that's why am here. Right here, I am using ..........Visual Studio (VB.net) 2012 ..........SQL Server 2012 I am actually creating a program to do two main functions.... 1). To Search for records from multiple MSsql tables and display the result in … |
| | I cannot make my program calculate the total of two integers (one on the main form, and the other on a different form). It keeps putting in the value "0", but when I tried it without a button it'd always just put one of the chosen integers instead of adding … |
| | hey guys i need some help on my code here.......... im trying to do some computation about the biling system or a library if the borrwer returns the book on time it will be no charge.......but if hte book is damage then it will charge him trice the ammount of … |
| | Hello, I am trying to make a program that allows redstone circuits to be made in for Minecraft,but how do I export the world into a .schematic file if the program each block ID and coords?  |
 | Hey Guys, I'm an A level student studdying Computer science, and hence using VB.NET for my coursework. Therefore I'm very novice at VB! While trying to update Data in a Microsoft Office, Access table (Office 2010) - I get this error. (In VB) Bare in mind, I've read all this … |
| | I have 2 graphics I draw onto a form. 1 Graphic is a Randomly Generated Star Field, these stars move, and are updated every tick on a timer(50ms) Once the stars have been drawn/updated a cockpit is overlayed onto this image to give the appearance of moving through space. The … |
| | I'm new at vb.net. i'm making a calculator using only 1 text box and want that my text box show the value( assigned to first variable at run time) along with the operator[+,-,*,/] in upper line and then the value entered in the lower line should be assigned to the … |
| | **For our final requirement before my groupmates and i can graduate we have to develop a LAN-Based Enrollment system we searched about the pros and cons when it comes to using either Access or MySql as the database and the majority of the results are in favor of using Mysql … |
| | OpenConn() Dim qqttyy As Integer = Val(ListView1.SelectedItems(0).SubItems(3).Text) Dim codee As String = ListView1.SelectedItems(0).SubItems(1).Text OleDa.UpdateCommand.CommandText = "UPDATE Inventry SET QTY = QTY -'" & qqttyy & "'WHERE CODE ='" & codee & "'" OleDa.UpdateCommand.ExecuteNonQuery() CloseConn() |
 | The code in this snippet (and attached project zip) demonstrates how to use a background worker thread to monitor a network address (name or IP). It shows how to start and stop the thread and how to update controls in the main thread using delegates. It should be simple to … |
| | I want to format my textboxes in such a way that when someone fills in the details in the textbox if they press enter button on the keybord the focus is given to the next textbox that they should fill in .I tried the code below that we used in … |
| | I TRIED TO POPULATE DATA FROM DATABASE INTO THE COMBO BOX AND. ... USING COMBOBOX TO RETRIEVE DATA FROM THE DATABASE AND DISPLAY IT IN TEXTBOX. Im using Vb.net with Acess database Please tell me how to do this. |
| | I have this webpage. It has a wysiwyg html editor. It will create a blog post to my blogs with its contents everytime I hit submit. I hired someone to create this webpage so I cannot edit it. I don't want to mess it up. I created a program in …  |
| | Can someone help me... I am new to vb.net with sql connection and I can't fix this error : variable name '@date' has already been declared. Variable names must be unique-- I need this to be fixed "ASAP" Im running out of time here because of the error here is … |
 | hi everyone! i was wondering if anyone could hed me in the right direction 2 programming a program like pinger (preferably vb.net). i have visual studio .net 10 so can someone help me? thx! |
| | Hello all. I'm using an API function via PInvoke, with the interesting data being returned to a pointer. My application crashes when attempting to free the pointer. If run with no breakpoints, the application hangs on Line 61 below. After the first run, it will then throw a memory exception … |
| | Private Sub ComboBox3_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox3.SelectedIndexChanged txtdayattended.Enabled = True sql = " select work_day from tbl_yearset where month='" & ComboBox3.Text & "'" If rs.State = 1 Then rs.Close() rs.Open(sql, conn) If rs.EOF = False Then txtworkday.Text = rs(0).Value End If End Sub Please let … |
| | Hi, I use databinding.addnew() but when I try to type data in cell an error message apper(DBNULL Exception).... Pls let me konw: How can I insert or edit data in DataGrid Thanks |
| | Hey guys i need some help on how to save Values in My.Settings Two texboxes to save two different values and be albe to read those values or laod them when the program is oppned again...and also to be able to be replaced those values... |
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