I am using the following code to try and update a database entry, the UPDATE statement works when i am not using parameters but when i am using them it seems to do absolutely nothing. No error and no update either.

PHP Code:
sqlString "UPDATE table SET field1 = @value1, field2 = @value2, field3 = @value3 WHERE field1 = @currentValue" 
 
dbCommand.CommandText sqlString 
dbCommand
.Parameters.AddWithValue("@value1"txtOne.Text
dbCommand.Parameters.AddWithValue("@field2 "txtTwo.Text
dbCommand.Parameters.AddWithValue("@field3 "txtThree.Text
dbCommand.Parameters.AddWithValue("@currentValue"lstListBox.SelectedValue
dbCommand.ExecuteNonQuery() 
Can anyone tell me why this isnt working?