It is not good to execute multiple db request for loading single page.  Review your database code to see if you have request paths that go to the database more than once. Each of those round-trips decreases the number of requests per second your application can serve. By returning multiple resultsets in a single database request, you can cut the total time spent communicating with the database.

In order to improve performance you should execute single stored proc and bring multiple resultset in to single db request.  In this article i will explain you how to avoid multiple database request and how to bring multiple resultset into single db request.

Consider a scenario of loading a Product Page, which displays

  • Product Information and
  • Product Review Information

In order to bring 2 database request in single db request, your sql server stored proc should be declared as below.

SQL Server Stored Proc

 @ProductId bigint,

--Product Information
Select ProductId,
From Product
Where ProductId = @ProductId

--Product Review Information
Select  ReviewerName,
From ProductReview
Where ProductId = @ProductId, C# Code to bring multiple db request into single db request

Code Inside Data Access Class Library (DAL)

public DataSet GetProductDetails()
SqlCommand cmdToExecute = new SqlCommand();
cmdToExecute.CommandText = "GetProductDetails";
cmdToExecute.CommandType = CommandType.StoredProcedure;
DataSet dsResultSet = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(cmdToExecute);

    var conString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnStr"];
    string strConnString = conString.ConnectionString;
    SqlConnection conn = new SqlConnection(strConnString);

    cmdToExecute.Connection = conn;

    cmdToExecute.Parameters.Add(new SqlParameter("@ ProductId", SqlDbType.BigInt, 8, ParameterDirection.Input, false, 19, 0, "", DataRowVersion.Proposed, _productId));

    //Open Connection

    // Assign proper name to multiple table
    adapter.TableMappings.Add("Table", "ProductInfo");
    adapter.TableMappings.Add("Table1", "ProductReviewInfo");

    return dsResultSet;             
catch (Exception ex)
    // some error occured.
    throw new Exception("DB Request error.", ex);

Code Inside .aspx.cs page

protected void Page_Load(object sender, EventArgs e)
   if (Request.QueryString[ProductId] != null)
      long ProductId = Convert.ToInt64(Request.QueryString[ProductId].ToString()); 
      DataSet dsData = new DataSet();

      //Assuming you have Product class in DAL
      ProductInfo objProduct = new ProductInfo();
      objProduct.ProductId = ProductId;
      dsData = objProduct.GetProductDetails();

      DataTable dtProductInfo = dsData.Tables["ProductInfo"];
      DataTable dtProductReviews = dsData.Tables["ProductReviewInfo"];

      //Now you have data table containing information
      //Make necessary assignment to controls


Hope above code gave you basic idea of why it is important to avoid multiple db request and how to bring multiple recordset with single db request.

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