datagridview not showing the first row vb.net - vb.net

Question

hi so i have this list that im currently using on a combobox that's why i have the idcategoria = 0 with the nomeCategoria = "Select your Category"so the combobox default item would be "select your category".
here is the code of the list
Public Shared Function ObterTodosC() As List(Of Ccategoria)
Dim lstTodos As List(Of Ccategoria) = New List(Of Ccategoria)
Dim p As Ccategoria = New Ccategoria()
p.IdCategoria = 0
p.NomeCategoria = "select your category"
lstTodos.Add(p)
Try
Using con As SqlConnection = New SqlConnection()
con.ConnectionString = myDAC._connectionString
Using cmd As SqlCommand = con.CreateCommand()
cmd.CommandText = "select * from Categoria"
con.Open()
Dim dr As SqlDataReader = cmd.ExecuteReader()
While dr.Read()
Dim p As Ccategoria = New Ccategoria()
p.IdCategoria = dr.GetInt32(0)
p.NomeCategoria = dr.GetString(1)
lstTodos.Add(p)
End While
End Using
End Using
Catch ex As SqlException
Throw ex
Catch ex As Exception
Throw ex
End Try
Return lstTodos
End Function
Now i want to use the same list on a datagridview and i wanted to know if there is a way to not show the id = 0 on the datagridview or do i have to create another list without the idCategorie = 0 for the datagridview, any ideas on this? thanks

Answer 1

Create another list from already loaded
Dim newList = lstTodos.Skip(1).ToList()
Skip method will return new collection without first item.
Notice that this approach will work only when - Select your Category - item is a first item in the list.
Or change your method to return list without - Select your Category - item and add it only when you need.
Public Shared Iterator Function ObterTodosC() As IEnumerable(Of Ccategoria)
Using con As SqlConnection = New SqlConnection()
con.ConnectionString = myDAC._connectionString
Using cmd As SqlCommand = con.CreateCommand()
cmd.CommandText = "select * from Categoria"
con.Open()
Dim reader As SqlDataReader = cmd.ExecuteReader()
While reader.Read()
Yield New Ccategoria With
{
.IdCategoria = reader.GetInt32(0),
.NomeCategoria = reader.GetString(1)
}
End While
End Using
End Using
End Function
Then you can create list of categories for datagridview
Dim forDataGridView = ObterTodosC().ToList()
Dim notSelectedCategory As New Ccategoria With
{
.IdCategoria = 0,
.NomeCategoria = "select your category"
}
Dim forComboBox = forDataGridView.ToList()
forComboBox.Insert(0, notSelectedCategory)
With this approach your remove side effect from ObterTodosC method.
So method responsibility will be only load items from database