retrieve values from database

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I have a table that i have created in vs 2008 only. i write a code to insert values in database.And it executed succesfully. but how to write a code that dislay me all the entered values or without using seqel server 2008 r2 or so on.my code for inserting values is as follows:

C#

SqlConnection connection1 = new SqlConnection();
      SqlCommand Insert = new SqlCommand();
      Insert.Connection = connection1;
      connection1.ConnectionString = (@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Acer\Documents\employeeDB.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
      int a = Convert.ToInt32(txtEmpId.Text);
      string b = txtEmpName.Text;
      int c = Convert.ToInt32(txtSalary.Text);
      string d = txtCity.Text;
      Insert.CommandText = "INSERT INTO Employeetable(EmpId,EmpName,Salary,City) Values (@a,@b,@c,@d)";
      Insert.Parameters.AddWithValue("@a", a);
      Insert.Parameters.AddWithValue("@b", b);
      Insert.Parameters.AddWithValue("@c", c);
      Insert.Parameters.AddWithValue("@d", d);
        Insert.Connection.Open();
      Insert.ExecuteNonQuery();
      Insert.Connection.Close();
      Response.Write("you have succesfully inserted data");
  }.

Thanks.tell me what code to write on read button that i have created on VS.

Posted 2-Jun-13 19:37pm

Rambo_Raja

Updated 2-Jun-13 19:55pm

Maciej Los

v3

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OriginalGriff · Answer 1 · 2013-06-02T19:49:00

It's very similar, but you need to change the query, and use a different function. There are two basic ways: one uses a DataReader, the other a DataAdapter:

C#

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand com = new SqlCommand("SELECT iD, description FROM myTable WHERE Id = @ID", con))
        {
        com..Parameters.AddWithValue("@ID", myTextBox.Text);
        using (SqlDataReader reader = com.ExecuteReader())
            {
            while (reader.Read())
                {
                int id = (int) reader["iD"];
                string desc = (string) reader["description"];
                Console.WriteLine("ID: {0}\n    {1}", iD, desc);
                }
            }
        }
    }

C#

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlDataAdapter da = new SqlDataAdapter("SELECT iD, description FROM myTable WHERE Id = @ID", con))
        {
        da.SelectCommand.Parameters.AddWithValue("@ID", myTextBox.Text);
        DataTable dt = new DataTable();
        da.Fill(dt);
        myDataGridView.DataSource = dt;
        }
    }