This should be easy but, I have a shipping system, where the user picks a shipment method, and a shipment weight must be based off the shipment method chosen. i.e If the user chooses 'Standard Air', which is on a drop down list in a combo box, the consignment weight must be =>1 and <1000.

I have made a variable, dConsignWeight as Double, and converted the textbox to a double with Cdbl(txtConsignWeight.Text).

Then I try to create the If statement.

If cmbShipmentMethod.Text = "Standard Air" Then
dConsignWeight >=1

This is where I get an error? What am I doing wrong? thanks.