Error On DataAdapter.fill

i have this code :



if(! IsPostBack)

            {

           
    string strConnection = "server=localhost; uid=sa;
pwd=sasasa; database=northwind";

                string strCommand = "Select * from Customers";



           
    SqlDataAdapter dataAdapter = new
SqlDataAdapter(strCommand, strConnection);



                DataSet dataset = new DataSet();



                dataAdapter.Fill(dataset, "Products");

           
    SqlCommandBuilder bldr = new
SqlCommandBuilder(dataAdapter);



                DataTable dataTable = dataset.Tables[0];

                dgCustomer.DataSource = dataTable;

                dgCustomer.DataBind();

            }



when i run this code, error like this appear :





Server Error in '/Registeration' Application.


SQL Server does not exist or access denied. Description:
An unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the error and
where it originated in the code.

Exception Details:
System.Data.SqlClient.SqlException: SQL Server does not exist or access
denied.

Source Error:





Line 41: DataSet dataset = new DataSet();
Line 42:
Line 43: dataAdapter.Fill(dataset, "Products");
Line 44: SqlCommandBuilder bldr = new SqlCommandBuilder(dataAdapter);
Line 45:
Source File:
e:asp.net
egisteration
egister.aspx.cs    Line: 43


Stack Trace:





[SqlException: SQL Server does not exist or access denied.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction)
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)
System.Data.SqlClient.SqlConnection.Open()
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
Registeration.WebForm1.Page_Load(Object sender, EventArgs e) in e:asp.net
egisteration
egister.aspx.cs:43
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()



Version Information: Microsoft .NET Framework Version:1.1.4322.573;
ASP.NET Version:1.1.4322.573



how can i solve this problem??? thank you...