ExecuteReader Example In Asp.Net C# VB.Net

SqlCommand ExecuteReader Method Example in Asp.Net Using C# And Vb

This method Execute the command and builds or populate the SqlDataReader object. It is used for accessing data when query returns a set of records for display or navigation purpose.

It provides a forward only, read only connected recordset which means it needs open Sql Connection untill DataReader is open.

Common usage of ExecuteReader Method can be populating a dropdownlist or listbox or retrieving binary files from database.

I have also explained NonQuery , Scalar and XmlReader methods.

C# CODE

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protected void Page_Load(object sender, EventArgs e)
    {
        string strConnection = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string strSelect = "SELECT Username FROM Users";

        //Create SQL Connection And SQLCommand
        SqlConnection con = new SqlConnection(strConnection);
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = con;
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = strSelect;

        con.Open();
        SqlDataReader dReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            while (dReader.Read())
            {
                ddlUsers.Items.Add(dReader["Username"].ToString());
            }
        dReader.Close();
    }

VB.NET

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Protected Sub Page_Load(sender As Object, e As EventArgs)
 Dim strConnection As String = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString
 Dim strSelect As String = "SELECT Username FROM Users"

 'Create SQL Connection And SQLCommand
 Dim con As New SqlConnection(strConnection)
 Dim cmd As New SqlCommand()
 cmd.Connection = con
 cmd.CommandType = CommandType.Text
 cmd.CommandText = strSelect

 con.Open()
 Dim dReader As SqlDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection)
 While dReader.Read()
  ddlUsers.Items.Add(dReader("Username").ToString())
 End While
 dReader.Close()
End Sub

Hope this helps.

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