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RowFilter

Posted on 2009-05-08
5
577 Views
Last Modified: 2012-05-06
I'm using RowFilter to sort a gridview when a dropdown menu selectedIndex is changed

when the page loads, the gridview displays and the dropdown menu is populated.

but, when I make a selection in the dropdown menu, the gridview comes up blank.

I've tried just hardcoding a value for the RowFilter to see if that would work and the gridview still comes up blank.

Any help is appreciated.
Thanks.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using DataViewRowFilterExample.NorthwindTableAdapters;
 
namespace DataViewRowFilterExample
{
    public partial class _Default : System.Web.UI.Page
    {
        CustomersTableAdapter custAdapter = new CustomersTableAdapter();
        CountriesTableAdapter countryAdapter = new CountriesTableAdapter();
        Northwind.CustomersDataTable custdt = new Northwind.CustomersDataTable();
        Northwind.CountriesDataTable countrydt = new Northwind.CountriesDataTable();
        Northwind ds = new Northwind();
 
        protected void Page_Load(object sender, EventArgs e)
        {
            custAdapter.Fill(custdt);
            countryAdapter.Fill(countrydt);
 
            if (!Page.IsPostBack)
            {
                ddlCountries.DataSource = countrydt;
                ddlCountries.DataValueField = "Country";
                ddlCountries.DataTextField = "Country";
                ddlCountries.DataBind();
           
                gvCustomers.DataSource = custdt;
                gvCustomers.DataBind();
            }
        }
 
        protected void ddlCountries_SelectedIndexChanged(object sender, EventArgs e)
        {
            int selectIndex = ddlCountries.SelectedIndex;
 
            DataView dv = new DataView();
            //dv.RowFilter = "Country = " + ddlCountries.SelectedItem.Value.ToString();
            dv.RowFilter = "Country = 'USA'";
            gvCustomers.DataSource = dv;
            gvCustomers.DataBind();
 
            ddlCountries.SelectedIndex = selectIndex;
        }
    }
}

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Question by:-Dman100-
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5 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 24340979
I would suggest a different course of action--use the DataView and the RowFilter all the time, and not just in the DropDownList_SelectedIndexChanged event handler.
0
 
LVL 20

Expert Comment

by:informaniac
ID: 24341864
U missed out this sentence...

DataView dv = custdt.Tables[0].DefaultView;

The code should look like this

DataView dv = custdt.Tables[0].DefaultView;
dv.RowFilter = "Country = 'USA'";
            gvCustomers.DataSource = dv;
            gvCustomers.DataBind();
0
 
LVL 7

Expert Comment

by:ajolly
ID: 24341865
of course..

You are just saying

DataView dv = new DataView();

which will create only empty view for you.
and you are binding with this empty view... so definitely .. you should see no records.

Probably your view should come from the datatable custdt
0
 

Author Comment

by:-Dman100-
ID: 24342422
I tried the following, but the datagrid is still empty?  Is this not the correc syntax?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using DataViewRowFilterExample.NorthwindTableAdapters;
 
namespace DataViewRowFilterExample
{
    public partial class _Default : System.Web.UI.Page
    {
        CustomersTableAdapter custAdapter = new CustomersTableAdapter();
        CountriesTableAdapter countryAdapter = new CountriesTableAdapter();
        Northwind.CustomersDataTable custdt = new Northwind.CustomersDataTable();
        Northwind.CountriesDataTable countrydt = new Northwind.CountriesDataTable();
        Northwind ds = new Northwind();
 
        protected void Page_Load(object sender, EventArgs e)
        {
            custAdapter.Fill(custdt);
            countryAdapter.Fill(countrydt);
 
            if (!Page.IsPostBack)
            {
                ddlCountries.DataSource = countrydt;
                ddlCountries.DataValueField = "Country";
                ddlCountries.DataTextField = "Country";
                ddlCountries.DataBind();
           
                gvCustomers.DataSource = custdt;
                gvCustomers.DataBind();
            }
        }
 
        protected void ddlCountries_SelectedIndexChanged(object sender, EventArgs e)
        {
            int selectIndex = ddlCountries.SelectedIndex;
 
            DataView dv = new DataView();
            dv = ds.Customers.DefaultView;
            //dv.RowFilter = "Country = " + ddlCountries.SelectedItem.Value.ToString();
            dv.RowFilter = "Country = 'USA'";
            gvCustomers.DataSource = dv;
            gvCustomers.DataBind();
 
            ddlCountries.SelectedIndex = selectIndex;
        }
    }
}

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LVL 20

Accepted Solution

by:
informaniac earned 500 total points
ID: 24342545
dv = custdt.DefaultView;
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