Bindingsource and writing to database

[pachjo]

I have set a combobox as follows:

 

 'set the bindings for the transaction description combobox

  Me.cboTransDescription.DataSource = glb_dbTransactionDescBinding

  Me.cboTransDescription.DisplayMember = "tran_description"

  Me.cboTransDescription.ValueMember = "tran_id"

This successfully populates the combobox and also allows me to add items which appear in the combobox.

 

I want to be able to delete the selected item in the combobox and found on this site that one should use a bindingsource to do so which I did and it does get removed from the combobox but I have found that neither adding or deleting affects the actual database.

 

Here is how I setup the bindingsource:

 

glb_taTransactionDesc.Fill(glb_dtTransactionDesc)

glb_dbTransactionDescBinding.DataSource = glb_dtTransactionDesc

and here is how I delete a record from the combobox but does not affect the database:

 

glb_dbTransactionDescBinding.Remove(glb_dbTransactionDescBinding.Current)

glb_taTransactionDesc.Update(glb_dtTransactionDesc)

Have I lost the plot and missed something important?

 

Thanks