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[Caligula]

I there i have this code

Dim desinftb As New maindatabaseDataSet.MateriaisDataTable

desinftb = maindatabaseDataSet.Materiais

Dim count As Integer

count = desinftb.Rows.Count


Dim b As Integer


For b = 0 To count


Dim asc As String

asc = MaindatabaseDataSet.Materiais.Rows(b).Item(0)
matcombo.Items.Add(asc)


Next


Me.BackColor = Color.Blue

Dim desinfta As New maindatabaseDataSet.TratamentosDataTable

desinfta = MaindatabaseDataSet.Tratamentos



Dim a As Integer




Dim counttra As Integer
counttra = desinfta.Rows.Count

For a = 0 To counttra


Dim bsc As String
bsc = MaindatabaseDataSet.Tratamentos.Rows(b).Item(0)
combotrat.Items.Add(bsc)



Next

This code allows me to get data from a table in a database and populate a combobox with it when the form loads but after the second next any code i write
the application doesn't read, like the code to puplate the second combobox. If anyone knows what the problem is, please hellp me.