I'm trying to Collect Bids and Distribute the average from a Column I'm getting an InvalidCast Exception: Specified cast is not valid. on the TotalSum +=
Dim sql As String = "SELECT " & Column & " FROM " & Table & " ;"
Dim dt As DataTable = SQLiteDatabase.GetDataTable(sql)
Column = Column.Replace("[", "")
Column = Column.Replace("]", "")
For Each row As DataRow In dt.Rows
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What are NULL values? Sometimes when I try to assign a query to variable, I get error saying:
Type-Cast-Error. txtMiddleName.Text = Reader.GetString(2)
How can I put it that if the value of the Middle is nothing then txtMiddleName.Text = "". Working on VS 2010 (VB.net) EDIT 1: This is the error Message I get (Line 364 is the above mentioned code)
I am using SQLite ADO.NET Provider.
I want to create a database with 2 tables via code in vb.net .
Please provide code for the same.
I am using VS 2010 Winforms, working under XP SP3 Pro
I have a date/time variable stored in a column in an SQLite table. I need to select the string with the last 3 digits trimmed off. [code]
View 1 RepliesI have a login form that consists of 2 text boxes: txtUser, txtPass. Now these are not bound to any data table & I don't what them to be bound. When a new user enters his user name & password, I want to add these on a data table that has two columns: User, Pass. Data table information: Data Source = Login.accdb, Data table = LoginTable, Connection = LoginCn. I use visual basic 2010. So how do I do this?
View 1 RepliesI currently have this working already for one of my combo box's, but when i try to use the same code i get this error ''There is no row at position 6.'' . The are 2 fields in the table asset_type_id, asset_type_name', im trying to dispaly the values in a combo box for the field 'asset_type_name.
the code for ' Friend Sub RetrieveCustomerInformation2()' works but the other friend sub throws the error.
Imports System.Data.SqlClient
Imports System.Data
Imports System
Imports System.Data.OleDb
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I am using a string builder to set up an html table row by row so that it can be emailed. I currently gather my information from the database using a data reader and while dataReader.read, I use stringbuilder.Append to add each cell value to the table.The issue is that after about 200 rows, the html breaks and displays a cell value above the table in the email. I have tried changing the cell padding, but this was not successful.
View 2 Replies[code]If I wanted to get Part Name for multiple PartIDs from OrderDetails, how would I go about doing this? Would I use two DataTables? I'm confused as I cannot see an efficient way to do this. The only thing that I can think of is to create a DataTable with SQL:[code]and then maybe use a For loop to take each PartID, create another DataTable to find the PartName for that and then give this to a variable. There could be up to 10 PartIDs to search through and I don't want to have variables such as PartID1 PartID2 etc. [code]
View 2 RepliesFirst one : i want add values to table and this is the code
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i want add values to table and this is the code
Dim AdCounter As SqlConnection = New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ElectricityBillsViewer.mdf;Integrated Security=True;User Instance=True")
Dim AddCounter As SqlCommand = New SqlCommand(" INSERT INTO CounterInformations
[code].....
but it's not working it shows me this error Incorrect syntax near ')'.I'v made a log in program aslo it's show me an error which is Incorrect syntax near ','. and this is the code i'm using
Protected Sub Command1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Dim SignINStr As String = "Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ElectricityBillsViewer.mdf;Integrated Security=True;User Instance=True"
[code].....
I have been doing some listings from database, from the table "Clients", however, when it arrives to the field "Status", like it was expected, it displays to me numbers (1, 2, 3 or 4) these numbers have a relationship with another table, called "Status", which have: Single, Married, Divorced and Widower (according with those numbers).
So, I'm using a DataSet to list all the field, how can I retrieve the text in the table "Status" according with the IDClient instead of retrieving numbers?
I have a table called Table1 which already has a few other columns and 4 rows. I want to add three new columns to it. When the columns are added I want all the cells in the column to equal the variable I supply in the Add method. When I add the column named "BatchID" it works beautifully, but when I add "UserID" it gives an error "Cannot find column [iqz9]". Why? This is how Table1 should look like:
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How do i use Variables as the values to insert into the SQL table. I tryed:
Dim cnnConnection As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=" & Application.StartupPath & "DatabaseRecords.mdf;Integrated Security=True;User Instance=True")
Dim ImportValuetoSQL As String = 1
Dim cmd As New SqlCommand
[code]....
I am having a problem storing the contents of a field to a STRING variable. It works when the field actually has data but when it's empty, i can't do anything with it. I would like to test to see if it's empty but I run into problems there as well.
VB Version is 2008 Express
DB is Acess 2003
OS is Vista 64-bit
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I need comparing value from the same table for my final project.
Example :
Table 1 :
SubjectCodeClasses
Sub Aclass 1
Sub Aclass 2
Sub Aclass 3
Sub Bclass 2
Sub Bclass 3
Sub Bclass 4
Sub Bclass 5
Sub Cclass 6
Sub Cclass 7
Sub Cclass 8
...
My task is, I need to compare the classes in the subject. Sub A with class 1, class 2, class 3 have to compare with Sub B and Sub C. if classes from Sub A exist in Sub B then the output is 0, if not the output is 1. then Sub A again will compare with Sub C and the rest. After Sub A compare its value with other subject. Sub B will start comparing with all the subject and so on.
Below is the concept.
Sub ASub BSub C
Sub A001
Sub B000
Sub C100
I really don't know to do the loop..
value 33 in the textbox and select 0.3 in combo box it should take 33,33.1,33.2,33.3 values of outside temperature and corresponding power values to display the graph.
what i have tried till now was
con = New SqlConnection(connec string")
cmd = New SqlCommand("select TOP 50 PERCENT * from Vijay ", con)
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i want to restrict -ve values entering into access database table.im using vb.net as front end...
View 5 RepliesI want to select top 4 values in sql table using vb.net.. how do i select it?
View 10 Repliessuppose we have three tables in the Database:
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I am working on TreeView Control. I want to create Nodes in the Treeview. For this,I have a DataGridView1 table which is having the Data.In this table i want to use First Column Data.
In the first column data the values like 3101,3102,3103....3201,3202...3301,3302,..3401,3402..So i want to create Treeview Nodes like 31 is the Parent Node and under Parent node i want to display 3101,3102,3103..are Chiled Nodes.
Finally my o/p is:
Category
31
3101
3102
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I have loaded a page in my webBrowser control, the page has a table, please see attached for screenshot and partial page source code. I want to load specific column of that table to datagridview, how can I do that?
View 2 Replieshave web page, In that I created table and loaded row values at run_time using javascriptNow I want to take a those table values in aspx.vb coding area, I tried it does not pull up my values even my table has 3 rows, but in aspx.vb area it shows row count as 0. How can I achieve this.
View 5 RepliesI am not getting any errors but the values of data table is not being inserted either
I have declared Public
Public x As Int16 = 0
Public table As New DataTable
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I am working on Visual Studio 2005, VB.At the back end,there is a table called "Marks" which has a column called "Subject". This column contains duplicate values.when the form loads,I want to display all the distinct values from the "Subject" column in the listbox.
View 2 RepliesI have a form that requires input from a user that will update a database table. So they are offered input boxes. What the input box will do is ask the user to enter a date, what that will then do is to mark a field marked 'code' in my sql table as "holiday" for that entire day.
View 4 RepliesI am using MS Access 2007. There are 2 tables in my database. One is for payments and other is for departments. In payments table, there is a field for departments. In my VB 2010 project, i want the departments field in the payments form to be in list box. And during the program is running, i want the option to add new departments and as soon as new department is saved, the list in payments form should also upadte.
View 3 RepliesI have 2 tables Table1 with columns [BId,Name,Amount] Table2 with columns [CId,BId, ExpenseType,Expense]. BId Is the foreign key in Table2. The Amount field in Table1 is always higher than Expense in Table2. I need to update the values of Amount (increase or decrease) based on value of Expense and I want to do it in single query in LINQ. Eg If the Expense has to be updated with 200, I would decrease(negate) Amount value with 200. If Expense is reduce to 100 then the Amount is increased by a value of 100.
View 1 RepliesA new project requires that we have two servers set up to accept requests. Originally we had a reporting system which queried a database and brought back various details to the user. We now obviously need to query two database on seperate servers and merge this information to provide real-time reporting.
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I want to implement a button that sends values typed in textboxes of gui(vb.net i'm using visual basic 2008) into a sql server table called Noms.
Example:
2 textboxes
id=1
nom = michael
Press button send the the 2 values into the 2 columns (id and name) of Noms table Then I enter in textbox(gui vb.net) id=2 and nom=mike So the output in my Noms table of sql server should be:
Id Nom
1 michael
2 mike
Here's the code implemented in button to send the values into the specified table:
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
'Public Class account
'myconnection=conexiune
'comandasql=mycommand
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I have looked all over the web for a way to set up a VB 2008 combobox but what I have seen makes me shudder! I want to , as In Access VBA, set the recordsource/datasource for the combobox i.e. the list shown in the combobox, to the values of another table (currency) and then when the user selects one of these values to store it in the (already) bound field of the combobox (to another table). In Access of course there was a wizard for this sort of thing, but in VB 2008 looks like it is just lots of code.
View 7 Replies