double enbasla, enbitis, enartis; 
              enbasla = double.Parse(textBox1.Text.ToString()); 
              enbitis = double.Parse(textBox2.Text.ToString()); 
              enartis = double.Parse(textBox3.Text.ToString()); 
              for (double i = enbasla; i <= enbitis; i = i + enartis) 
              { 
                     try 
                  { 
                      bag.Open(); 
                      komut.Connection = bag; 
                      komut.CommandText = "Insert Into hesap(en) Values ('" + i + "')"; 
                      komut.ExecuteNonQuery(); 
                      listele(); 
                      MessageBox.Show("Kaydedildi !"); 
                      bag.Close(); 
                  } 
                  catch 
                  { 
                      bag.Close(); 
                      MessageBox.Show("Hata Var!"); 
                  } 
                  finally 
                  { 
                       for (int i = 0; i < this.Controls.Count; i++) 
                      { 
                          if (Controls[i] is TextBox) Controls[i].Text = ""; ; 
                      } 
                  }