SQL Yardım

using System; 
  using System.Data; 
  using System.Data.SqlClient; 
  using System.Collections.Generic; 
  using System.Linq; 
  using System.Web; 
   
  /// <summary> 
  /// Summary description for Fonksiyon 
  /// </summary> 
  public class Metodlar 
  { 
  	public Metodlar() 
  	{ 
  		// 
  		// TODO: Add constructor logic here 
  		// 
  	} 
   
      public SqlConnection baglan() 
      { 
          SqlConnection baglanti = new SqlConnection("Data Source=localhost;Initial Catalog=orhanbul;Integrated Security=True"); 
          baglanti.Open(); 
          return (baglanti); 
      } 
   
      public int cmd(string sqlcumle) 
      { 
          SqlConnection baglan = this.baglan(); 
          SqlCommand sorgu = new SqlCommand(sqlcumle, baglan); 
          int sonuc = 0; 
   
          try 
          { 
              sonuc = sorgu.ExecuteNonQuery(); 
          } 
          catch (SqlException ex) 
          { 
              throw new Exception(ex.Message + " (" + sqlcumle + ")"); 
          } 
          sorgu.Dispose(); 
          baglan.Close(); 
          baglan.Dispose(); 
          return (sonuc); 
      } 
   
      public DataTable GetDataTable(string sql) 
      { 
          SqlConnection baglanti = this.baglan(); 
          SqlDataAdapter adapter = new SqlDataAdapter(sql, baglanti); 
          DataTable dt = new DataTable(); 
          try 
          { 
              adapter.Fill(dt); 
          } 
          catch (SqlException ex) 
          { 
              throw new Exception(ex.Message + " (" + sql + ")"); 
          } 
          adapter.Dispose(); 
          baglanti.Close(); 
          baglanti.Dispose(); 
          return dt; 
      } 
   
      public DataRow GetDataRow(string sql) 
      { 
          DataTable table = GetDataTable(sql); 
          if (table.Rows.Count == 0) return null; 
          return table.Rows[0]; 
      } 
   
      public string GetDataCell(string sql) 
      { 
          DataTable table = GetDataTable(sql); 
          if (table.Rows.Count == 0) return null; 
          return table.Rows[0][0].ToString(); 
      } 
  }