SqlCE Wont Load Data Into Dataset Table

Sep 15, 2009

In the below code, it is supposed to load the data from the dataset, into the table, so that I can view and navigate the records.My problem is, that when the statement runs, it errors with:

System.Data.ConstraintException was unhandled "Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints."

Here's the code:

[code]...

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I have a dataset (WW1Dataset) with one data table(WW1).(database used in an access database) I'm trying to filter the dataset e.g a user wants to filter by a chosen surname (SurnameTextBox.text) so the datset is filtered to display only those records wherethe surname column in the dataset matches SurnameTextBox.text.

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I have used Access databases before so thought I'd try something different. My problem is that when I try to add a new record to one of the tables in the databasethe code runs through fine, but the data is not added into the table :S have probably missed something simple, but it's been a while since I did any projects using a database.Here's my code:

Imports System.Data.SqlServerCe
Public Class Form1
Dim con As SqlCeConnection = New SqlCeConnection("Data Source=C:UsersMattDocumentsVisual

[code].....

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I'm receiving the following error when trying to use a table adapter to Load data into a form.

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I'm using a TeraData backend and this is pulling up the form based on selection from search results.

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[Code]....

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[Code]....

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I am designing a form to Enter new City Name list where i accept following fields

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A first chance exception of type 'System.InvalidCastException' occurred in MyApp.exe

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Here's the code:

If Me.DataSet3.HasChanges Then
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' 'insert that row into the auditing table

[Code].....

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I'm using the following code to import data from a text file into an existing Access table:

[Code]...

The first time i ran the code, it caused no error but no records where loaded into the table. The second time it causes the OleDbException "Table 'TEMP' already exists."explain me wath am i doing wrong? The text file is comma delimited and it has exactly the same number of columns of the TEMP table.

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[Code]...

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I have a DataGridView which populates from an SQL query just fine in default mode

using these table names
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[code]....

I have edited the column headers and set the column names to the same values as my table names yet the data is not showing in form load I have set datagridview.AutoGenerateColumns = False I know the data is there if I delete datagridview.AutoGenerateColumns = False then the data is shown with the default headings?

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I have tried everything I can to get beyond this error which shows below as <<<<< error here. It is trying to fill a dataset from a data adapter. If I change the SELECT statement to just SELECT * FROM xTable I get the correct number of records in each table. But anytime I try with a more complex statement I get the error message shown below which indicates System.Data.Common.DbDataAdapter.Fill(DataSet dataSet. I've completely erased all data and entered a new set of test data so I know there is no problem with relationships. Each table has primary key which is foreign key in other table. IS there something wrong with the Imports section: Imports System

[Code]...

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Sub to load the form and datagrid view
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[Code].....

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