Delete, Search And Update Records in ADO.NET

Hi.

I am facing problem in my update command. i am trying to update my database but getting "not updated" mesasge.Search and Delete commands are working properly. Please help me as soon as possible.

 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace Std_Course

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

SqlConnection conn;

SqlCommand comm;

SqlDataReader dreader;

string connstring = "server=localhost;database=TestPhase2;Trusted_Connection=True";

///

/// Update Button

///

///

///

private void Updatebutton_Click(object sender, EventArgs e)

{

conn = new SqlConnection(connstring);

conn.Open();

comm = new SqlCommand("update Std_Course set Course_Code= " + CCodetextBox.Text + " , Course_Name=' " + CNametextBox.Text + ",Cridet_Hours=' " + CHourstextBox.Text + "' where Std_roll_number = " + RNotextBox.Text + " ", conn);

try

{

comm.ExecuteNonQuery();

MessageBox.Show("Updated..");

}

catch (Exception)

{

MessageBox.Show(" Not Updated");

}

finally

{

conn.Close();

}

}

///

/// Search Button

///

///

///

private void Searchbutton_Click(object sender, EventArgs e)

{

conn = new SqlConnection(connstring);

conn.Open();

comm = new SqlCommand("select * from Std_Course where Std_roll_number = " + RNotextBox.Text + " ", conn);

try

{

dreader = comm.ExecuteReader();

if (dreader.Read())

{

CCodetextBox.Text = dreader[1].ToString();

CNametextBox.Text = dreader[2].ToString();

CHourstextBox.Text = dreader[3].ToString();

}

else

{

MessageBox.Show(" No Record");

}

dreader.Close();

}

catch (Exception)

{

MessageBox.Show(" No Record");

}

finally

{

conn.Close();

}

}

///

/// Delete Button

///

///

///

private void Deletebutton_Click(object sender, EventArgs e)

{

conn = new SqlConnection(connstring);

conn.Open();

comm = new SqlCommand("delete from Std_Course where Std_roll_number = " + RNotextBox.Text + " ", conn);

try

{

comm.ExecuteNonQuery();

MessageBox.Show("Deleted...");

CCodetextBox.Clear();

CNametextBox.Clear();

CHourstextBox.Clear();

RNotextBox.Clear();

RNotextBox.Focus();

}

catch (Exception x)

{

MessageBox.Show(" Not Deleted" + x.Message);

}

finally

{

conn.Close();

}

}

private void Form1_Load(object sender, EventArgs e)

{

RNotextBox.Focus();

}

}

}