Use a SqlParameter to represent stored procedure return values and output parameters : SqlParameter « ADO.net Database « ASP.NET Tutorial
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- ADO.net Database
- SqlParameter
File: GetProductCount.sql
CREATE PROCEDURE dbo.GetProductCount
AS
RETURN (SELECT COUNT(*) FROM Products)
File: ShowProductCount.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">
void Page_Load()
{
lblProductCount.Text = GetProductCount().ToString();
}
private int GetProductCount()
{
int result = 0;
string connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("GetProductCount", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@ReturnVal", SqlDbType.Int).Direction = ParameterDirection.ReturnValue;
using (con)
{
con.Open();
cmd.ExecuteNonQuery();
result = (int)cmd.Parameters["@ReturnVal"].Value;
}
return result;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Product Count</title>
</head>
<body>
<form id="form1" runat="server">
<div>
There are
<asp:Label
id="lblProductCount"
Runat="server" />
products in the database.
</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>