C#

byte[] arr = new byte[6] { 68, 65, 84, 65, 13, 10 };
string str = Encoding.ASCII.GetString(arr);

[DllImport("TestERP.dll", CallingConvention = CallingConvention.StdCall)]
    private static extern int GetArray(string baseval,ref int nb,ref IntPtr array,IntPtr msg);

    [DllImport("TestERP.dll", CallingConvention = CallingConvention.StdCall)]
    private static extern int freeMemory( int nb, ref IntPtr array);


public static void GetManagedArray()
    {
         string[] tmp = new string[12];
         int nb = 0;
         IntPtr msg = Marshal.AllocHGlobal(256);
         string tmp2 = "";
         IntPtr intArr = IntPtr.Zero; 

         //call the C function which return the arry of string intArr
         GetArray("val",ref nb,  ref intArr,msg);

         //copy in managed string array
         for (int i = 0; i < nb; i++)
            tmp[i] = Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(intArr, i * IntPtr.Size));

         tmp2 = Marshal.PtrToStringAnsi(msg);

         Marshal.FreeHGlobal(msg);

         //call the C function whiec free memory
         freeMemory(nb, ref intArr);

         intArr = IntPtr.Zero;

         GC.Collect();

    }

int __stdcall GetArray(char base[],int* nb,char*** array,char* outmsg)
{
    int i =0;

    (*array) = (char**)calloc(12, sizeof(char*));

    for (i = 0; i < 12; i++)
    {
        (*array)[i] = calloc(256,sizeof(char));
        sprintf((*array)[i],"%s %d",base,i) ;
    }

    *nb= 12;

    strcpy(outmsg,"message erreur");

   return 0;
}

int __stdcall freeMemory(int nb,char*** array)
{
    int i =0;

    for (i = 0; i < nb; i++)
    {
        free((*array)[i]);
        (*array)[i] = NULL;
    }

    free((*array));

    *array = NULL;

    return 0;
}

private static DataTable CreateTable(int RowCount)
        {
            DataTable tbl = new DataTable();
            tbl.Columns.Add("Question", typeof(string));
            tbl.Columns.Add("A", typeof(string));
            tbl.Columns.Add("B", typeof(string));
            tbl.Columns.Add("C", typeof(string));
            tbl.Columns.Add("D", typeof(string));
            tbl.Columns.Add("E", typeof(string));
            for (int i = 0; i < RowCount; i++)
                tbl.Rows.Add(new object[] { String.Format("Question: {0}", i), "", "", "", "", "" });
            return tbl;
        }
                                         
public Form1()
 {
    InitializeComponent();
    gridControl1.DataSource = CreateTable(5);
 }
                                         
private void gridView1_RowCellStyle(object sender, RowCellStyleEventArgs e)
   {
     GridView View = sender as GridView;
     if (e.Column.FieldName == "A" || e.Column.FieldName == "B" || e.Column.FieldName == "C" || e.Column.FieldName == "D" || e.Column.FieldName == "E")
     {
     if (e.RowHandle >= 0)
         { 
            e.Appearance.BackColor = Color.Green;
           //gridView1.Appearance.FocusedCell.BackColor = Color.Green;
         } 
     }
   }