I received a rather nasty shock to discover that you can't use the BindingNavigator Validating event to stop navigating to the next, previous, first or last record in a DataSource if there are validation errors on your Form. If you are using a DataGridView then set e.Cancel to true in the DataGridView's RowValidating event:
private
void form1Form_Load(object sender, EventArgs e)
{
this.jobTableAdapter.Fill(this.hermesDataSet.Job);
form1DataSet.Job.ColumnChanging += new
DataColumnChangeEventHandler(Job_ColumnChanging);
jobDataGridView.RowValidating += new
DataGridViewCellCancelEventHandler(jobDataGridView_RowValidating);
}
void Job_ColumnChanging(object sender, DataColumnChangeEventArgs e)
{
if (e.Column.ColumnName == "JobItem")
{
if (string.IsNullOrEmpty(e.ProposedValue.ToString()))
{
e.Row.SetColumnError(e.Column.ColumnName, "Item cannot be empty");
}
else
{
e.Row.SetColumnError(e.Column.ColumnName, string.Empty);
}
}
}
void jobDataGridView_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
{
if (hermesDataSet.Job.HasErrors)
{
e.Cancel = true;
}
}
If you are aren't using a DataGridView then set e.Cancel to true in the Control's (e.g. TextBox ) Validating event:
private
void taskStateNameTextBox_Validating(object sender, CancelEventArgs e)
{
if (string.IsNullOrEmpty(taskStateNameTextBox.Text))
{
taskStateErrorProvider.SetError(taskStateNameTextBox, "Name cannot be empty");
e.Cancel = true;
}
else
{
taskStateErrorProvider.SetError(taskStateNameTextBox, string.Empty);
}
}