How to Find out if an items is not in an array - vb.net

Question

Ok i just want to know if value x is not in my array
Heres what i have been trying
Im using VB.net
and just need to know when x isnt in the array so i can take an action. thankx
Dim L, Path(0) As Integer
Open = cleara(Open)
sealed = cleara(sealed)
Open(0) = Agent
sealed(0) = Agent
Finds adjacent nodes
L = Agent
Do Until sealed(sealed.GetLength(0) - 1) = Targ Or Open.GetLength(0) = 0
'Agents(0) = L
H = Find_H(L, Targ, Open)
'T = Find_T(L, Targ, Open)
ReDim F(T.GetLength(0) - 1)
For lp As Integer = 0 To F.GetLength(0) - 1
F(lp) = H(lp) '+ H(lp)
Next
L = Find_lowest(F, Open)
Open = Remove_from(Open, L)
sealed = Add_to(sealed, L)
Ad = Find_adjacent(L, Targ)
For lp As Integer = 0 To Ad.GetLength(0) - 1
Ok here is where my problems is
What i need to do is
find out if ad is in seal if yes ignore it
If ad isnt in sealed the if it is in open compare T values
if ad isn in sealed or open then add it to open and set L as parent of ad
The below was a way to test and see if the values were loading into the arrays right
If Walk(Ad(lp)) <> -1 Then
Parents(Ad(lp)) = L
Open = Add_to(Open, Ad(lp))
For lp2 As Integer = 0 To sealed.GetLength(0) - 1
For lp3 As Integer = 0 To Open.GetLength(0) - 1
If lp3 < Open.GetLength(0) - 1 Then
If Open(lp3) = sealed(lp2) Then
Open = Remove_from(Open, sealed(lp2))
End If
End If
Next
Next
End If
Next
G.Graphics.DrawRectangle(Pens.White, Grid(Targ))
TempDrawing()
Loop
This is suppost to be an a* program but i have been having trouble main with my heuistics if you can tell me what im doing wrong it would also be a great help
Here is how this work so far
Add my location to open
Create H,G,F for items in open list
Find lowest F
Find adjacent nodes
Loop through nodes
If node is not walkable then ignore
If in sealed ignore (this is where im stuck at)
If not in sealed and is walkable then if in open compare G scores else add to open

Answer 1

try this
If Array.IndexOf(yourArray, x) == -1 Then
'Do something
End If

Answer 2

This need to be for -
For lp as integer = 0 to array.getlength(0) - 1
^ error. Needs to array.GetLength()
Also, if a number is found, you can print it and break from the loop. There is no need to iterate further in the loop.
You need to be careful, the variable that is used as a flag( i.e., g) is different from the variable actually setting a value to it. ( i.e., G )

Answer 3

You forgot to assign initial value to g outside of the for loop.
Try this.
Dim g as int
g = 0
For lp as integer = 0 to array.Length() - 1
If X = array(LP) Then
g = 1
Exit For
End If
next
If g = 0 Then
X is not in array
End If

Answer 4

Use the Enumerable.Except method to get all points in one enumerable collection that are also present in a second collection.
Here is an example taken from the MSDN documentation of the method:
' Create two arrays of doubles.
Dim numbers1() As Double = {2.0, 2.1, 2.2, 2.3, 2.4, 2.5}
Dim numbers2() As Double = {2.2}
' Select the elements from the first array that are not
' in the second array.
Dim onlyInFirstSet As IEnumerable(Of Double) = numbers1.Except(numbers2)
Dim output As New System.Text.StringBuilder
For Each number As Double In onlyInFirstSet
output.AppendLine(number)
Next
' Display the output.
MsgBox(output.ToString())
' This code produces the following output:
'
' 2
' 2.1
' 2.3
' 2.4
' 2.5