add textbox in rows in grid

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C#

WPF

how can i add an array of text box into grid in row and column :

  public void AddTable(int row,int col)
        {
            int i, k;
            int basex = 15;
            int basey = 15;
            int count = 0;
        GroupBox group = new GroupBox();  // for managing txtTable 
        Grid grid2 = new Grid();
            for (i = 0; i < 100; i++)
            {
                txtTable[i] = new TextBox();
                txtTable[i].Visibility = Visibility.Hidden;
            }
            for (i = 0; i < row; i++)
            {
                for (k = 0; k < col; k++)
                {
                    txtTable[count].Margin = new Thickness(basex, basey,0,0);
                    txtTable[count].Visibility = Visibility.Visible ;
                    txtTable[count].Text = "";
                    grid2.Children.Add ( txtTable[count]);
                    
                    count++;
                    basex += 25;
                }
                basex = 15;
                basey += 25;
            }
            group.Content = grid2;
            group.Visibility = Visibility.Visible;
            group.Header = "matris";
            group.VerticalAlignment = VerticalAlignment.Top;
            group.HorizontalAlignment = HorizontalAlignment.Right;
            grid2.Visibility = Visibility.Visible;
            grid1.Children.Add(group); // grid1 is main grid
           
          
}

i wrote this code but in the screen,size of text boxes are not equivalent