obcon.cmd.CommandText = " select f_name + ' ' + m_name + ' ' + l_name from contact where type='" & ledcmbsrctype.Text & "'"
obcon.con.Open()
Dim dr As SqlDataReader
[code]....
'name is added to combo box and i want to get id for selected name.
While 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 RepliesVB GridView control will not allow code in the vb code file to access a data column that has its visible property set to false. When it is set to true, the data column can be accessed with no problem. Any suggestions as to how to correct this? I have looked through the documentation, text books, and I have not found anything that gave me any clue as to what the problem could be. I thought that the property was just applied to the column, not that it would remove the column from being accessible.
[Code]...
I have code on log in form but it only get the latest data on username and password column on my database
Here is my code
Public Class Users
Dim MyLogIn As New myRecords
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
[CODE]...
This is my connection:
Imports MySql.Data
Imports MySql.Data.MySqlClient
Module myconnect
[CODE]...
This is my record:
Imports System
Imports System.Data
Imports MySql.Data
Imports MySql.Data.MySqlClient
[CODE]...
Ive created one database Sql Server Compact Edition 2005, with one table ("Cliente") I know that I can created my database good, but i have a problem saving information since three textbox, in my table(With columns "Nombre" "Apellido" "Cliente". In my form there is a button save ("Guardar"). When I do click in my button appear the next message : "The column cannot contain null values. [ Column name = Nombre,Table name = Cliente ] " and happen the same with apellido and Id_Cliente. And this happen becouse my code cant save the information....
This is the code
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Imports System.Data
[CODE]...
And the code for my button is:
Private Sub cmdguardar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdguardar.Click
Dim myconnection As SqlCeConnection
Dim mycommand As SqlCeCommand
[CODE]...
I have the following POCO:
Public Class T1
<Required()>
<MaxLength(128)>
<Key(), Column(Order:=0)>
Property K1 As String
[Code]...
I would expect C2 to be created as Nullable, but both C1 and C2 are Not Null. Adding
<Required(AllowEmptyStrings:=True)>
Does not make a difference, as it seems the decoration is aimed at data validation, not DB creation.
So how do i get a nullable column with Code First?
I am trying to figure out how to write code for a for/next loop that will retrieve a particular column, or field to add the grand total of the objects located therein. This is what I have:
Private
Sub subCalculate()
'this sub is used to figure and list the total price of the selected category
Dim drArray() As DataRow
Dim pintCount As Integer
Dim pdecTotal As Decimal
[code]...
Using MS Access 2003 I am trying to build a command button in a form which clears the contents of a table column (which are tick boxes) - the idea behind it is this - the database is a contacts database for a club. Every year there is a subscription to be paid, so I want a column to annotate those who have paid (using a tick box). At the end of the year this will be reset - hence the reason for trying to produce a command button that clears out the ticks. What I using is this ....Private Sub Command11_Click()Dim strSQL As StringstrSQL = "UPDATE TBL-Master SET TBL-Master.campaign = '';"DoCmd.RunSQL strSQLEnd Sub(TBL-Master is the table name, campaign is the column name)What I am getting is a runtime error - 3144 -
View 3 RepliesIs there a way to set the size of each column's width in code?
*i have used this code to view my databse into my datagrid [code]...
I have a range in excel and I want to be able to sort it by one column programmatically.
There is range.sort, but it has a ridiculous about of parameters and I cannot get it to work.
Surely there must be something to be able say I want this data to be sorted by this column?
I have a report made in Crystal Reports XI. The report is generated and exported to PDF in visual basic script using COM interface. Generally everything is running smoothly, but in one case generation breaks with error: Failed to retrieve data from the database. Details: [Database Vendor Code 9421]
Database used is MSSQL 2005 connected over ODBC to CR XI. When I am opening report with exactly the same parameters in Designer, everything works fine.It looks like it is data related, but it is hard to trace since the whole report is pretty sophisticated. Anyway I spent half a day on crawling over Dr. Google and it seems that he has no clue what might be an issue.
I did the following
Imports System.Data
Imports System.data.OleDb
Public Class Form1
Dim con As OleDb[code].....
By this i can fetch only one row(the last row) of the access....how to modify the above code to fetch all the rows starting from the begining from the database..........
I tried to add a calendar control column to a datagridview using code i found on the internet, and for some reason now im getting a designer error that i have no clue how to fix.
View 15 RepliesDim Application = From AL In db.AnnualLeave _
Where AL.Approval <> True _
Select LeaveID, EmpID, Name
[code]....
after calling `GridView3.DataBind(), why do i still get Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index.at this line of code GridView3.Columns(1).Visible = False yet the grid has rows and more than 2 columns. Note that the Gridview columns have NOT been defined at design time.
I have been asked to convert a column (11) in a datagridview. The dgv is populated in code thusly:
Dim dt As DataTable = MyDAL.GetDataTable(SQL, Params)
With dgvContracts
.DataSource = dt
.Columns(0).Visible = False
.Columns(1).Visible = False
[Code]...
I have a listview with several columns. I want to change the column header using code.
View 1 Replieshow to refer to a column created in code for a listview, I need to set it's width property but don't know how to refer to it in code.
lsvOrderDetails.Columns.Clear()
lsvOrderDetails.Columns.Add("Product")
So im currently making a program, basicly i want the user to put in a certain code into a text box, then when they hit the button, visual basic opens the excel spreadsheet, and seaches for the code the put it, so i have this excel sheet that has like a billioncodes and the names of the codes, so the names of the codes are in column a, and the codes are in column b, i want vb to open the spreadsheet, search through column b from top to bottom, then close the spreadsheet, and put the name of the code from column a into a label so the user can see. and possibly pop up with an error box if it doesnt find the code.
View 2 RepliesI have a column in DB called price with Decimal as its datatype. when I use:dim r as objectAccessConnection.Open()cmd = AccessConnection.CreateCommand()r = cmd.CommandText = "SELECT AVG (Price) FROM Sale;"I receive an error "Decimal byte array constructor requries an array of length four containing valid decimal bytes."It works fine with other datatype such as Integer and Double. What is my problem?
View 1 RepliesI have a form in which i need to add column depending on the counts of records in database. For that i need to set column count using code.
View 4 RepliesI am trying to create the code which will stop duplicate entry of an Account Number being entered in the column 'Account Number'. The user is to input an account number (three digit account number i.e 153) using an input box and this will then be printed into the A column.What is the best way to prevent duplicate account numbers being entered?
The code I have for the input/account number array so far is:
[Code]...
How do I find Line 40 and column 89 in my code. I get the following error message.Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types. Line 40 column 89.
View 1 RepliesI have a datagrid on my form that has a dataset bound to it via the datagrid properties Tables collection. I have the PreferredColumnWidth property of the datagrid set to 75. How can I change the column width in code to match my column header text?
View 4 RepliesHow do I find Line 40 and column 89 in my code. I get the following error message. Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types. Line 40 column 89.
View 2 RepliesWhere am i going wrong with this line of code? I think its with the (REO/Bank_Owned_Desc)
compute
[code...]
There is no column REO is REO/Bank Owned Desc, I would think it doesnt like the /between REO and Bank.But that is what the column is called in the database.
I have a Database named CarsType.accdb there are four fields in the data base Item_Name, Item_Num, Item_Qty, Item_Cost.
I am able to get the database to display my data in VisualBasic but I am not sure how to get the total cost to appear in my label (lblTotalCost). I prefer doing it in VB versus writing in my access program. All I am wanting to do it multiply item_qty * Item_Cost How would I go about doing that?[code]...
How to get get complete column from database to combo box ?
View 4 RepliesI have encountered a problem where in my database I have a column that is a bit either 0 or 1 specifying if a user is an admin or is account suspended or not. And in my VB code I am trying to retrieve that bit. Example code:
Dim dtRequests As DataTable
dtRequests = New DataTable("Users")
dtRequests.Columns.Add("SESLoginID", System.Type.GetType("System.Int32"))
[Code]....
I tried getting rdr.GetByte(3), this tells me cast not valid, but there is no function of which will say GetBit, and if such exists I could not find it.
I am using the following code to add a row to an exisitng databse and now I am trying to add a column, the code executes ok with no error messages and the column is being added to the datatable, but it does not appear to be added to the database can anyone see what I am doing wrong?
[Code]...
I need to add a column to an existing table in my database. I am having trouble adding a column to my database. I physically go into Microsoft Access and add the column, my problem comes up when Visual Studio does not recognize the table. Basically, I think I'm doing something wrong.
View 5 Replies
