convert string to decimal

Having parsed your string to a decimal, you'll still need to apply formatting to get it to display to one decimal place. This should do it:

Dim  decStr As String  = "1"
Dim dec As Decimal  =  Decimal.Parse(decStr)
decStr = dec.ToString("0.0")

To Convert a string to a double can can use

the Double.Parse method it takes a string and returns

a double value

Hope this helps,

Sam