.NET (Core and Framework)

class ByteColor
{
  public byte R;
  public byte G;
  public byte B;
}

Bitmap myBMP=new Bitmap("myimage.jpg");
int iW=myBMP.Width; 
int iH=myBMP.Height;
ByteColor[,] myPixelMatrix=new ByteColor[iW,iH];

for(int w=0; w<iw;w++)>
{
   for(int h=0; h<ih;h++)>
   {
     Color tmpColor=myBMP.GetPixel(w,h);
     
     byte cR=Convert.toByte(tmpColor.R);
     byte cG=Convert.toByte(tmpColor.G);
     byte cB=Convert.toByte(tmpColor.B);

     myPixelMatrix[w,h].R=cR;
     myPixelMatrix[w,h].G=cR;
     myPixelMatrix[w,h].B=cR;
   }
}

Rectangle rect = new Rectangle(0, 0, myBMP.Width, myBMP.Height);
BitmapData ImageColorData = myBMP.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

unsafe
{
    IntPtr pointer = ImageColorData .Scan0;
    int Bytesnmpr = ImageColorData .Stride * myBMP.Height;
    byte[] ColorValues = new byte[Bytesnmpr];
    Marshal.Copy(pointer, ColorValues , 0, Bytesnmpr);

    for (int i= 0; i< ColorValues .Length; i++) 
    {
        //copy the byte to your buffer or do what you want with it here
    }

    Marshal.Copy(ColorValues , 0, pointer , Bytesnmpr);
}
 myBMP.UnlockBits(ImageColorData);

<asp:TemplateField>
	<ItemTemplate>
		<asp:Button ID="btnViewApp" CommandName="ViewApplication" Text ="View" ToolTip ="View Application" runat ="server" CssClass ="Button" />
	</ItemTemplate>                                                   
</asp:TemplateField> 

Protected Sub gridview_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gridview.RowCommand
	If e.CommandName = "ViewApplication" Then
		{code to hide the row here.}
	End If
End Sub

Dim btn As Control = DirectCast(e.CommandSource, Control)
Dim grw As GridViewRow = DirectCast(btn.NamingContainer, GridViewRow)
Session("celltext") = grw.Cells(0).Text