I did this code to iterate through the data present in the DataTable:
Imports System.Data.OleDb
Public Class Form1
Dim con As New OleDbConnection
[Code]....
But this code always gives the last value of a particular row as its output.
I want to specify a particular column and a particular row of the DataTable and fetch the corresponding result:How to do this?
I have created a datatable and now i need to print it,so i did the following:
Private Sub PrintDocument1_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
Dim xPos As Single = 20
[CODE]...
The code works fine.But in the above code as you can see that i am printing the each rows content of the datatable one by one and after printing all the contents of a single row i am looping the code again for printing each and every row present in the datatable. So i want to know that inspite of printing each and every data present in the row of the datatable,is it possible to print the entire datarow at a time and then loop through all the rows present in the datatable?
i am using visual studio 2005 check my code and let me know what i am doing wrong
[Code]...
Can you maybe tell me what is wrong with this code?I get an error on the line were the writing is in red.
db.OpenConnection()
strSQL = "SELECT * FROM ChaletBookings WHERE BookingNo = '" & strBookingNo & "'"
dr = db.getData(strSQL)
[code].....
I am wondering if it is possible to iterate using columns of datatable.
I have tried something like this:
Dim myCol As New DataColumn
Dim myRow As DataRow = Nothing
Dim myCell As New DataGridCell
[Code]....
The following code executes successfully 48 times. During the 49th iteration after executing (or during execution of) bitmap.EndInit() the for each loop stops executing and the xaml window appears. Anyone have any idea what might be occurring?
[Code]...
I am creating a datatable and then adding a column to it which is filled with data from existing column and parsed into correct format DateSold is my existing column from my datafile and I create NewDateSold by adding the column to the existing table and then parsing the information in date format.
This is added to a binding source which then is used to populate a combobox I want to be able to sort the combo box by NewDateSold Desc I was able to this on the original column by simply using the "order By" in my query, it seems now that I added new column it is no longer sorted? I am finding different solution such as using dataview and wish to know the best way to do this
I'm using VB.net 2005 and sql server 2000 i'm fetching the data into datagridview, but datagridview has several datasource depending on the "select case " Now can i export the data from datagridview without referring to dataset/datatable?
View 1 RepliesI'm new here, but I always exhaust myself in research before I go asking for help with my code. What I'm actually doing is porting a program I wrote in AutoIT proprietary code over to vb by hand. I've really come far and have figured out out how to read/write data to an XML file, which was the biggest challenge. I'm having a little bit of a rough spot with iterating nodelist data and then adding it to a listview in order.Here's what I have within a sub that begins to pull data from the file.
[Code]...
This adds data a row at a time, which is what I want. But look at the data I'm feeding it, node.innertext.I have to iterate the specific nodelist before I can use node.innertext. Putting .subitems.add in the iteration just results in a huge mess. I thought about using a function to return the data and then drop the function name in there, but whenever I iterate within the function it only ever returns the first item (it iterates only once even though there are more than one interations). Hopefully someone can point me in the right direction, I don't need to be spoonfed the answer.
just created a classlibrary project named CreatingDll and i did this
Public Class Class1
Public Function getComboTable() As DataTable
Dim dt As New DataTable
[code]....
I want to iterate through the records in an SQLCompact 3.5 data table and combine the field values into a string.The database file is connected to the project.I created a dataset that contains the tables from the database.If I drag and drop any datasource table as a grid onto a form I can view the data.[code]I have tried using the tableadapter.Ran into errors when the Date2 value = DBNull, never could get around those.I've tried dataview and datareader on the dataset.datatable but never could get these to load any data rows.I could sure use an uncomplicated unconvoluted way to simply read the rows of data in a database datatable.
View 7 RepliesThe user will enter a folder name in the combobox1 and clicking the create folder button the folder will be created in the applications bin folder; For doing this, i did this
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If ComboBox1.Text = "" Then
[Code]....
Now when the user enters a file name in the combobox2 and clicks the save button(Save button is not shown in the snapshot) then a .txt file with the name entered by the user in the combobox2 will be created in the folder whose name is specified in the combobox1.
i want to compare a column present in the access database BankAccount table with a field present in the form named as account......
[Code]...
I have a datatable and I apply a filter to the defaultview.rowfilter property of that datatable. If I then loop through the rows collection of the datatable, will I only be able to see those rows that the filter applies to, or will it loop through all the rows?
View 6 RepliesI'm working on a ASP.NET website project using VB.NET as backend code. I was looking for a way to show the header/footer of a gridview even if no data is present. I'd like to use this solution as it looks pretty clean (although it's written in C#): link I have converted the code using an online tool, resulting in: [URL] This however shows an error on line 77: "Events cannot be declared with a delegate type that has a return type"
View 1 Repliesi gave input text file. now i should copy the contents of the text file.need code.
View 3 RepliesIn a nutshell...I have developed a site in ASP.Net and VB.Net which allows a user to create an order and submit it to a SQL Server backend database.
When the order is placed...an xml file is also produced, showing the items that have been ordered...which is then loaded in to a program to update stock quantities.
The code I have is as follows:
Public Sub butSubmitOrder_Click(sender As Object, e As EventArgs) Handles butSubmitOrder.Click
Dim sqlConn As New SqlConnection
[Code].....
I am not sure why this code doesn't work. I have follow according to the table field data and it I am still unable to get the SQL Datareader to work. I have checked the tables and all datafields, everything is correct. But I still am unable to read data from the database.
Dim connectionString = ConfigurationManager.ConnectionStrings("CleanOneConnectionString").ConnectionString
Dim myConn As New SqlConnection(connectionString)
myConn.Open()
Dim cmd = "Select * from [Member] where Email = @Email"
Dim myCmd As New SqlCommand(cmd, myConn)
[Code] .....
I'm trying to use the .NextResult() method of a DataReader but I get an error that no data is present.
The 1st query returns a value but the 2nd query is the problem.
Dim strSqlStatement As String = "Select Count(*) As TotalRows " & _
"From Parents " & _
"Where (FatherName = @SearchValue " & _
[Code]......
When I run my application the following code prompts an error. Ideally, I want to populate the TxtOracleNo with a value read from another table on my form based on certain conditions i.e., prac_no, prac_eid and pay_method is the same in both tables then populate the Oracle No on TxtOracleNo text box.
The error given is
"Invalid attempt to read when no data is present"
The function is shown below
Private Sub Oracleview()
'Open the database.
'Delete any existing record
Dim cmd As New SqlCommand
Dim conn As SqlConnection = GetDbConnection()
[Code] .....
I checked that data in the database and it is available in both tables. Probably, the problem is where I call the function. Presently, I call it on loadform.
What I'm trying to do is to write a generic rss reader that I plug in any URL into without worry if the feed has all the common properties. For instance in my example below I'm looking for pubDate, however if no pubDate exists in the xml I'd like to return the current Date. I cannot seem to get the syntax right though.
Dim xmldoc As New XDocument
xmldoc = XDocument.Load(url)
Dim feeds = From feed In xmldoc.Descendants("item") Select New With { _
[code].....
how to copy data from datatable to table in dataset i ry this but its readonly property
ds.datatable1=newdt.copy
I am updating a data table (dt_report_crypt) from an encrypted csv file in the code below:I decrypt the colums and update the same dreport_crypt, such that it will contain de-crypted data.This part is working wellI however need to use this de-crypted datatable as a data source to update a second table(dt_report), using the sql SELECT command to filter relevant data,
Dim dt_report As DataTable
Dim dt_report_crypt As DataTable
Using cn As
[code].....
I have a number of controls (Device1, Device2, etc.) that all inherit from BaseDeviceControl. In the DragEnter event handler I am trying to test for the correct type by using the BaseDevvceControl like this....
[Code]....
I have a problem which I am struggling to efficiently put into code. I have a datatable
ID | NAME | DATE | JOB
0 | Joe | 01/01 | Selling
1 | Bob | 03/01 | Buying
[code].....
I have a datagrid which has been bound to a datatable.If I sort the grig lets say by surname order I would like to export that datatable in that sorted order but whenever I do it never seems to be sorted.sorted order.
Basically what I see in the grid is how I want my exported table to be.
I probably shouldn't go down these roads, but stuff like this just gets to bugging me. Of course, with any of three possible database backends I should expect some quirks.I have a table that has one primary key field and several NOT NULL fields.So I do a SELECT * from the table and populate a .net datatable with the results.I can create a new row for the table, add the value for the primary key field, and then add the new row to the datatable. Everything works fine in Access.But in Oracle the situation is different.I have to supply values for all the NOT NULL fields before I can add the row to the datatable. As far as I can tell the two tables are the same in the two databases in both databases there is one PK field and the same fields are defined as NOT NULL. So why does the .net data provider for Oracle care when I try to add a row that does not have values in a NOT NULL field and the Access provider not?
View 5 RepliesI am facing below problem. Cannot perform '=' operation on System.Int32 and System.String.
What I tried to do here is I have a dataset get from SQL Express 2005 and I am adding a new row to it and it hit the above error.I combine 3 tables in SQL and return the data to my win application.And I add 1 row to it. here is the data type in my sql statement.
SELECT cd.indexNo, c.custid, c.companyname, c.contactperson, c.contactno,
dt.Type, cdm.DrawingMaterial, cd.Size, cd.Roundness
FROM rpts_customer As c, rpts_custdiesdetail As cd,
rpts_Type As dt, rpts_CustDrawMaterial As cdm
WHERE c.custID = cd.custID AND
cd.cdmNo = cdm.cdmNo AND
[Code]...
how can i navigate the datatable with the help of a BindingSource?
here lies the
con = New OleDbConnection("Provider=Microsoft.Jet.Oledb.4.0;Data Source=db1.mdb")
con.Open()
cmd = New OleDbCommand("Select * from Table1", con)
[Code].....
I have a datatable and I want to delete individual rows on the basis of a certain condition. How to do it in minimum lines of code possible?
View 2 Replies
