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Код

//задаю массивы
int[,] graph = new int[14, 14];
int a;
TextBox[,] tb;

tb = new TextBox[,] {
            { textBox2, textBox3, textBox4, textBox5, textBox6, textBox7, textBox8, textBox9, textBox10, textBox11, textBox12, textBox13, textBox14, textBox15 },
            { textBox16,textBox17, textBox18, textBox19, textBox20, textBox21, textBox22, textBox23, textBox24, textBox25, textBox26, textBox27, textBox28, textBox29 },
               и тут ещё строки..}};
------------
 private void button2_Click(object sender, EventArgs e)
        { 
               for (int i = 0; i < a; i++)
                {
                        for (int j = 0; j < a; j++)
                    {
                         graph[i, j] = Convert.ToInt32(tb[i, j].Text); 
                    }
                }
}