mysql conected to vb.net

[Tengkorak]

i think this wrong in your delete code :

Dim Sql As String = "DELETE FROM asignatura Where ID_ASIGNATURA= 'id.Text.Trim'"

should be:

Dim Sql As String = "DELETE FROM asignatura Where ID_ASIGNATURA= '" & id.Text.Trim  & "'"

id.Text.Trim is textbox control, doesn't it ?