برنامج وسؤال #c

private void textBox1_TextChanged(object sender, EventArgs e)
		{
			switch (textBox1.Text)
			{
				case "":
					label3.Text = "00";
					label4.ForeColor = System.Drawing.Color.Gray;
					label4.Text = "تم المسح";
					break;
				case " ":
					label3.Text = "0";
					break;
				case "أ":
					int a = 1;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ا":
					a = 1;
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ؤ":
					a = 1;
					label3.Text = a.ToString();
					break;
				case "ب":
					a = 2;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ج":
					a = 3;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "د":
					a = 4;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
				case "ه":
					a = 5;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "و":
					a = 6;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ز":
					a = 7;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "ح":
					a = 8;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
				case "ط":
					a = 9;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ي":
					a = 10;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ك":
					a = 20;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "ل":
					a = 30;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
				case "م":
					a = 40;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ن":
					a = 50;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "س":
					a = 60;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "ع":
					a = 70;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
				case "ف":
					a = 80;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ص":
					a = 90;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ق":
					a = 100;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "ر":
					a = 200;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
				case "ش":
					a = 300;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ت":
					a = 400;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ة":
					a = 400;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ث":
					a = 500;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "خ":
					a = 600;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
				case "ذ":
					a = 700;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DarkOrange;
					label4.Text = "ناري";
					break;
				case "ض":
					a = 800;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.Tan;
					label4.Text = "ترابي";
					break;
				case "ظ":
					a = 900;
					label3.Text = a.ToString(); 
					label4.ForeColor = System.Drawing.Color.PowderBlue;
					label4.Text = "هوائي";
					break;
				case "غ":
					a = 1000;
					label3.Text = a.ToString();
					label4.ForeColor = System.Drawing.Color.DodgerBlue;
					label4.Text = "مائي";
					break;
			}
		}