What's wrong with this Sudoku code?

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C#

I've written a Sudoku code and just tried to check if columns were corect. I will be controlling rows and squares later. Although it seems right to me. It doesn't work. the simulator freezes. Here is the code:

TextBox[,] dene = new TextBox[9,9];
Random b = new Random();
int kontrol = 0;
int m=0;

for (int i = 0; i < 9; i++)
{
    for (int j = 0; j < 9; j++)
    {
        dene[i, j] = new TextBox();
        dene[i, j].Text = "0" ;
    }
}


for (int i = 0; i < 9; i++)
{
    for (int j=0;j<9;j++)
    {
        while (m == 0)
        {
            int inta = b.Next(1, 10);
            for (int k = 0; k < 9; k++)
            {
                int c = Convert.ToInt32(dene[i, k].Text);
                if (inta == c)
                {
                    kontrol++;
                }
            }
            if (kontrol == 9)
            {
                dene[i, j].Text = inta.ToString();
                kontrol = 0;
                m = 1;
            }
            else
            {
                kontrol = 0;
            }
        }
        m = 0;
    }
}