Help please....cannot delete

Dear Experts,

Has anyone could help me please to fix this code...it always failed I tried many time?...This is a "Delete" button, when I press this button, it should be delete row/item on the database...but it always failed....here is the code:
VB Code:
Private Sub CommandButton3_Click()
 
 Dim con As ADODB.Connection
    Set con = New ADODB.Connection
    con.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\exercise.mdb"
    
    Set rst = Execute_SQL_ReturnRecordSet("Select * from Item", False, "C:\exercise.mdb")
    
         rst.MoveFirst
Do While rst.EOF = False
    If UserForm1.txtqty.Text = rst.Fields("Item_Code").Value Then
       Exit Do
    End If
    rst.MoveNext
Loop
 
    TextBox3.Text = rst.Fields("Qty")
        
    Application.ScreenRefresh
End Sub
When I select item no 1 (using a combo box), then when I press "Check Current Stock" it show its Qty which is "1"...BUT, when I select other item numbers, let say item code number 3 it still show the Qty for item number 1...???....

Please help with code corrections...

Thank you so much... :confused:

Jennifer