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Form 2 is to enter ladder base and its off set value and for snakes where the snake head is and skakes off set value.
Not able to figure out why its not working . When the values are entered to show simulation it show's up error sandl is private and the other one is the validation one .
Public Class Form2
Dim sandl(99) As Integer
Dim snakeshead As TextBox()
Dim snakesoffset As TextBox()
Dim ladderfoot As TextBox()
Dim ladderoffset As TextBox()
Dim rnd As Random = New Random
Sub initialise()
For i = 0 To 99
sandl(i) = 0 ' reset data
Next
End Sub
Sub snake()
snakeshead = {txthead1, txthead2, txthead3, txthead4, txthead5, txthead6, txthead7, txthead8, txthead9, txthead10}
snakesoffset = {txtoffset1, txtoffset2, txtoffset3, txtoffset4, txtoffset5, txtoffset6, txtoffset7, txtoffset8, txtoffset9, txtoffset10}
' SnakeHead(i).Text = (i + 81).ToString
' SnakeOffset(i).Text = "10" '(i + 10).ToString
For i As Integer = 0 To 9
While True
Dim base = rnd.Next(90) + 11
If sandl(base - 1) <> 0 Then
Continue While
End If
Dim offset = rnd.Next(20) + 10
If base - offset < 1 Then
Continue While
End If
snakeshead(i).Text = base.ToString
snakesoffset(i).Text = offset.ToString
sandl(base - 1) = -offset
Exit While
End While
Next
End Sub
Sub ladders()
ladderfoot = {txtladder1, txtladder2, txtladder3, txtladder4, txtladder5, txtladder6, txtladder7, txtladder8, txtladder9, txtladder10}
ladderoffset = {txtladderoffset1, txtladderoffset2, txtladderoffset3, txtladderoffset4, txtladderoffset5, txtladderoffset6, txtladderoffset7, txtladderoffset8, txtladderoffset9, txtladderoffset10}
'For i As Integer = 0 To 9
' LadderFoot(i).Text = (i + 11).ToString
' LadderOffset(i).Text = "10"
For i As Integer = 0 To 99
sandl(i) = 0 'reset data
Next
For i As Integer = 0 To 9
While True
Dim base = rnd.Next(90) + 1
If sandl(base - 1) <> 0 Then
Continue While
End If
Dim offset = rnd.Next(20) + 10
If base + offset > 100 Then
Continue While
End If
ladderfoot(i).Text = base.ToString
ladderoffset(i).Text = offset.ToString
sandl(base - 1) = offset
Exit While
End While
Next
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
For i As Integer = 0 To 99
sandl(i) = 0 'reset data
Next
Dim valid = Validate(ladderfoot, ladderoffset, +1, "Ladder")
If (valid) Then
valid = Validate(snakeshead, snakesoffset, -1, "Snake")
End If
If (valid) Then
'Form3 = New Form3
Form3.ShowDialog()
End If
End Sub
Private Function Validate(tbBase() As TextBox, tbOffset() As TextBox, delta As Integer, s As String) As Boolean
For i As Integer = 0 To 9
Dim base As Integer
If ((Not Integer.TryParse(tbBase(i).Text.Trim(), base)) OrElse (base < 1) OrElse (base > 100) OrElse (sandl(base - 1) <> 0)) Then
MessageBox.Show(s & (i + 1).ToString() & " base is invalid.")
tbBase(i).Select()
tbBase(i).SelectAll()
Return False
End If
base -= 1 'zero based
Dim offset As Integer
If ((Not Integer.TryParse(tbOffset(i).Text.Trim(), offset)) OrElse (offset < 10) OrElse (offset > 30) OrElse (base + offset * delta < 0) OrElse (base + offset * delta >= 100)) Then
MessageBox.Show(s & (i + 1).ToString() & " offset is invalid.")
tbOffset(i).Select()
tbOffset(i).SelectAll()
Return False
End If
sandl(base) = offset * delta 'write offset
Next
Return True
End Function
End Class
Public Class Form3
Enum EState
Dice
Move
Slide
Wait
Win
End Enum
Dim Fnt = New Font("Arial", 16)
Dim FntBig = New Font("Arial", 256)
Dim Frame As Integer = -1 'counter
Dim State = EState.Dice
Dim Rnd As Random = New Random
Dim Dice As Integer
Dim Pos As Point = New Point(32, 640 + 32)
Dim CurrentIndex As Integer = -1
Dim NextIndex As Integer
Dim TargetIndex As Integer
Private Sub Form3_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dice = 0
Frame = -1
State = EState.Dice
Pos = New Point(32, 640 + 32)
CurrentIndex = -1
End Sub
Private Sub PictureBox1_Paint(sender As Object, e As PaintEventArgs) Handles PictureBox1.Paint
DrawBackground(e.Graphics)
Frame += 1
Dim oldState = State
Select Case State
Case EState.Dice
If Frame = 0 Then
Dice = Rnd.Next(6) + 1 'roll dice
TargetIndex = CurrentIndex + Dice
NextIndex = CurrentIndex
ElseIf Frame >= 63 Then
If CurrentIndex + Dice < 100 Then
State = EState.Move 'valid dice
Else
State = EState.Wait 'invalid dice
End If
Dice = 0
End If
Case EState.Move
If Frame Mod 64 = 0 Then
CurrentIndex = NextIndex
If CurrentIndex = TargetIndex Then
If CurrentIndex < 99 Then 'not win
If Form2.sandl(CurrentIndex) <> 0 Then
State = EState.Slide 'snake or ladder
Else
State = EState.Dice 'empty tile
End If
TargetIndex = CurrentIndex + Form2.sandl(CurrentIndex)
Else
State = EState.Win 'win
End If
Else
NextIndex = CurrentIndex + 1 'move
End If
Else
Dim c = GetCoordinate(CurrentIndex)
Dim n = GetCoordinate(NextIndex)
Dim dx = (n.X - c.X)
Dim dy = (n.Y - c.Y)
Pos.X = c.X * 64 + (dx * (Frame Mod 64)) + 32
Pos.Y = c.Y * 64 + (dy * (Frame Mod 64)) + 32
End If
Case EState.Slide
If Frame >= 63 Then
CurrentIndex = TargetIndex
If CurrentIndex < 99 Then
State = EState.Dice 'not win
Else
State = EState.Win 'win
End If
Else
Dim c = GetCoordinate(CurrentIndex)
Dim n = GetCoordinate(TargetIndex)
Dim dx = (n.X - c.X)
Dim dy = (n.Y - c.Y)
Pos.X = c.X * 64 + (dx * (Frame Mod 64)) + 32
Pos.Y = c.Y * 64 + (dy * (Frame Mod 64)) + 32
End If
Case EState.Wait
If Frame >= 63 Then
State = EState.Dice
End If
End Select
e.Graphics.FillEllipse(Brushes.Blue, Pos.X - 16, Pos.Y - 16, 32, 32) 'draw player
If Dice > 0 Then
Dim size = e.Graphics.MeasureString(Dice.ToString, FntBig)
e.Graphics.DrawString(Dice.ToString, FntBig, Brushes.Black, 320 - size.Width / 2, 320 - size.Height / 2) 'print dice
End If
If State <> oldState Then
Frame = -1 'reset counter
End If
If State <> EState.Win Then
PictureBox1.Invalidate() 'schedule next paint
End If
End Sub
Private Sub DrawBackground(g As Graphics)
For y As Integer = 0 To 9
For x As Integer = 0 To 9
If (((x + y) Mod 2) = 0) Then
g.FillRectangle(Brushes.LightGray, x * 64, y * 64, 64, 64) 'dark rectangle
End If
Dim z = (9 - y) * 10 + x + 1
If y Mod 2 = 0 Then
z = (9 - y) * 10 + (9 - x) + 1
End If
g.DrawString(z.ToString, Fnt, Brushes.Black, x * 64, y * 64) 'number
Next
Next
For i As Integer = 0 To 99
If Form2.sandl(i) <> 0 Then
Dim base = GetCoordinate(i)
Dim offset = GetCoordinate(i + Form2.sandl(i))
If Form2.sandl(i) > 0 Then 'ladder
Dim delta = Math.Abs(base.X - offset.X) + 4
g.DrawLine(Pens.Green, base.X * 64 + 32 - delta, base.Y * 64 + 32, offset.X * 64 + 32 - delta, offset.Y * 64 + 32) 'left part
g.DrawLine(Pens.Green, base.X * 64 + 32 + delta, base.Y * 64 + 32, offset.X * 64 + 32 + delta, offset.Y * 64 + 32) 'right part
Else 'snake
g.DrawLine(Pens.Red, base.X * 64 + 32, base.Y * 64 + 32, offset.X * 64 + 32, offset.Y * 64 + 32) 'red line
End If
End If
Next
End Sub
Private Function GetCoordinate(i As Integer) As Point
Dim result As Point
result.Y = 9 - (i \ 10)
result.X = i Mod 10
If result.Y Mod 2 = 0 Then
result.X = 9 - result.X
End If
Return result
End Function
End Class

Answer 1

In Form2, change your declaration from
Dim sandl(99) As Integer
to
Public sandl(99) As Integer
This would allow Form3 to access your integer array
Rename your Validate method to something else, like ValidateTextBoxes, or if you intend to overload the base.Validate, then declare as
Private Overloads Function Validate