using System;
using Word = Microsoft.Office.Interop.Word;
 
class Program
{
    static void Main(string[] args)
    {
        const int columns = 4;
        const int rows = 3;
        int[,] array = new int[rows, columns] { { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 } };
        Word.Application application = new Word.Application();
        Object missing = Type.Missing;
        application.Documents.Add(ref missing, ref missing, ref missing, ref missing);
        Word.Document document = application.ActiveDocument;
        Word.Range range = application.Selection.Range;
        Object behiavor = Word.WdDefaultTableBehavior.wdWord9TableBehavior;
        Object autoFitBehiavor = Word.WdAutoFitBehavior.wdAutoFitFixed;
        document.Tables.Add(range, rows, columns, ref behiavor, ref autoFitBehiavor);
        for (int i = 0; i < rows; i++)
            for (int j = 0; j < columns; j++)
                document.Tables[1].Cell(i + 1, j + 1).Range.Text = array[i, j].ToString();
        application.Visible = true;
    }
}