c#

 
 using System; 
 using System.Collections.Generic; 
 using System.Drawing; 
 using System.Windows.Forms; 
 using System.Linq; 
 namespace dee 
 { 
 	  
 	public partial class MainForm : Form 
 	{ 
 		public MainForm() 
 		{ 
 			  
 			InitializeComponent(); 
 		  
 		} 
 		void Button1Click(object sender, EventArgs e) 
 		{ 
 			string[] lines = System.IO.File.ReadAllLines(@"C:\Users\goksem\Desktop\veriler.txt"); 
 			for (int j = 0, linesLength = lines.Length; j < linesLength; j++)  
 			{ 
 				var i = lines[j]; 
 				 
 				if (j%2==0) 
 				{ 
 					richTextBox1.SelectionFont = new Font(richTextBox1.Font, FontStyle.Bold); 
 				} 
 				 
 				var ad = i.Split(' ').ElementAtOrDefault(1); 
 				var soyad = i.Split(' ').ElementAtOrDefault(2); 
 				var numara = i.Split(' ').ElementAtOrDefault(3); 
 				richTextBox1.SelectionColor = renkçevir(i.ElementAtOrDefault(0)); 
 				richTextBox1.AppendText(ad + " "); 
 				richTextBox1.SelectionColor = renkçevir(i.ElementAtOrDefault(1)); 
 				richTextBox1.AppendText(soyad + " "); 
 				richTextBox1.SelectionColor = renkçevir(i.ElementAtOrDefault(2)); 
 				richTextBox1.AppendText(numara + "\n"); 
 				 
 			} 
 		} 
 		 
 		 
 		private static Color renkçevir(char karakter) 
 		{ 
 			Color renk = Color.Black; 
 			switch (karakter) 
 			{ 
 					case 'k': renk= Color.Red; 
 					break; 
 					case 'm': renk=  Color.Blue; 
 					break; 
 					case 'y': renk=  Color.Green; 
 					break; 
 			} 
 			 
 			return renk; 
 		} 
 	} 
 }