Returning a Single Value : SqlCommand « ADO.net Database « ASP.NET Tutorial

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ASP.NET Tutorial » ADO.net Database » SqlCommand 
18. 3. 4. Returning a Single Value
File: Default.aspx

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Web.Configuration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    protected void btnSearch_Click(object sender, EventArgs e)
    {
        string connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
        SqlConnection con = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand("SELECT Totals FROM Products WHERE Title=@Title", con);
        cmd.Parameters.AddWithValue("@Title", txtTitle.Text);
        using (con)
        {
            con.Open();
            Object result = cmd.ExecuteScalar();
            if (result != null)
                lblResult.Text = String.Format("{0:c}", result);
            else
                lblResult.Text = "No match!";
        }
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Execute Scalar</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h1>Box Office Totals</h1>

    <asp:Label
        id="lblTitle"
        Text="Product Title:"
        AssociatedControlID="txtTitle"
        Runat="server" />

    <asp:TextBox
        id="txtTitle"
        Runat="server" />

    <asp:Button
        id="btnSearch"
        Text="Search"
        OnClick="btnSearch_Click"
        Runat="server" />

    <hr />

    <asp:Label
        id="lblResult"
        Runat="server" />

    </div>
    </form>
</body>
</html>

File: Web.config

<configuration>
  <connectionStrings>
    <add name="Products" 
         connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
  </connectionStrings>
</configuration>
18. 3. SqlCommand
18. 3. 1. Create SqlCommand from sql statement and connection
18. 3. 2. Executing a Command
18. 3. 3. Executing a Command with Parameters
18. 3. 4. Returning a Single Value
18. 3. 5. Read scalar data by using SqlCommand
18. 3. 6. Execute insert command by using SqlCommand
18. 3. 7. Execuate select command by using the SqlCommand
18. 3. 8. Execute update command
18. 3. 9. Attach SqlCommand to DataGrid
18. 3. 10. Pass a CommandBehavior.CloseConnection parameter to the ExecuteReader() method.
18. 3. 11. Executing Asynchronous Database Commands
18. 3. 12. Avoid SQL injection
18. 3. 13. Avoid SQL Injection attack
18. 3. 14. Browser Snoop
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