[RESOLVED] XNA Help

[mouse88]

I have started making my game after running through some XNA tutorials but have run into a problem.

Firstly Here is my class for creating blocks:

Imports Microsoft.Xna.Framework
Imports Microsoft.Xna.Framework.Graphics

Public Class Block

    'Define Block Objects'
    Public BlockSB As SpriteBatch = New SpriteBatch(Device)
    Public BlockTex As Texture2D = Nothing
    Public BlockRect As Rectangle = Nothing
    Public BlockTexCreationParams As TextureCreationParameters = TextureCreationParameters.Default

    'Define Block Variables'
    Public CanShoot As Boolean = True
    Public BlockSize As New Size(25, 25)
    Public BlockColor As String
    Public BlockPosition As Point


    Public Sub CreateBlock()

        BlockTex = Texture2D.FromFile(Device, "../../Resources/" & BlockColor & "Block.png", BlockTexCreationParams)
        BlockRect.Height = BlockSize.Height
        BlockRect.Width = BlockSize.Width
        BlockRect.X = BlockPosition.X
        BlockRect.Y = BlockPosition.Y

    End Sub

    Public Sub New(ByVal InitialColor As String, ByVal InitialPosition As Point)

        BlockColor = InitialColor
        BlockPosition = InitialPosition

    End Sub

End Class

Next this is my code which i am using to set up new blocks in a 2dimensional array:

Private Sub SetUpInitialBlocks()

        Dim Color As String = "Black"

        'First Row'
        For i As Integer = 0 To 9

            Blocks(i, 0) = New Block(Color, StartLoc)
            Blocks(i, 0).CreateBlock()

            If Color = "Black" Then
                Color = "Red"
            Else
                Color = "Black"
            End If

        Next

    End Sub

Then this is my code for rendering graphics:

Private Sub Render()

        If Device Is Nothing Then Return

        'Clear The Back Buffer To Black'
        Device.Clear(ClearOptions.Target, Microsoft.Xna.Framework.Graphics.Color.Black, 1.0F, 0)

        'Draw All Non Block Textures'
        NonBlockSB.Begin(SpriteBlendMode.AlphaBlend)
        NonBlockSB.Draw(FrameTex, FrameRect, Color.White)
        NonBlockSB.Draw(GameBoardTex, GameBoardRect, Color.White)
        NonBlockSB.End()

        'Draw Starting Blocks'
        For X As Integer = 0 To 9
            For Y As Integer = 0 To 14

                Blocks(X, Y).BlockSB.Begin(SpriteBlendMode.AlphaBlend)
                Blocks(X, Y).BlockSB.Draw(Blocks(X, Y).BlockTex, Blocks(X, Y).BlockRect, Color.White)
                Blocks(X, Y).BlockSB.End()

            Next Y
        Next X

        Device.Present()

    End Sub

When it gets to rendering the blocks in the render sub i am getting the following error message referring to the block i am trying to draw:

Object reference not set to an instance of an object.

Im not sure why its throwing this message as i have the SetUpInitialBlocks Sub which is used to create the new blocks.

I may be doing something completely wrong here as i have only just started with the XNA as advised above so if anyone has any suggestions i would appreciate it greatly.

Thanks in advance

[Atheist]

Compare the SetUpInitialBlocks method and the Render method. In the first one, you have a simple loop, in the second one, you have two nested loops. Simply put, you are iterating through more elements in the second one, than in the first one. What does that tell us?

[mouse88]

Problem solved, thanks a lot for the help really appreciate it