Listview and numeric up and down

iv experimented everywhere for when:

the numeric up and down function equals one then it will ad 1.50 to the list box price

VB Code:

numup.value = "1.50"

thats the numeric up and down value code i think its rite

and then

VB Code:

txttot.text = txtdis.text + numup.value

does that look rite i cant get it to work :/

what about

Code:

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txttot.text = Convert.ToInt16(txtdis.text + numup.value)

or

txttot.text = Convert.ToInt16(txtdis.text + numup.value).ToString

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