How to retrieve multiple table information using dropdownlist,gridview controls in asp.net

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ASP.NET

<asp:DropDownList ID="DropDownList1" runat="server" 
            onselectedindexchanged="DropDownList1_SelectedIndexChanged">
            <asp:ListItem>--select table--</asp:ListItem>
            <asp:ListItem>Student</asp:ListItem>
            <asp:ListItem>category</asp:ListItem>
            <asp:ListItem>logindetails</asp:ListItem>
        </asp:DropDownList>
        <asp:GridView ID="GridView1" runat="server">
        </asp:GridView>
<pre lang="c#">

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 System.Data.SqlClient;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
        SqlConnection con = new SqlConnection("Data Source=VICTORIN11-PC\\SQLEXPRESS;Initial Catalog=db;Integrated Security=True");
        SqlDataAdapter da;
        DataSet ds = new DataSet();
        con.Open();
        for (int i = 0; i < DropDownList1.Items.Count; i++)
        {

            string s = "select * from " + DropDownList1.Items[1].ToString();
            da = new SqlDataAdapter(s, con);
            da.Fill(ds, DropDownList1.Items[i].ToString());

        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DataSet ds = new DataSet ();
        DropDownList1.DataSource = ds.Tables[DropDownList1.SelectedIndex];
    }
}

Hi Friends help me

In the above .cs code cannot bind the table information.

I'm developing web application like dropdownlist,gridview controls in ddl items like tables names and when i'm clicking the first item and it loads the first table information to the gridview control and second item clicking that table information binding to gridview control.Give me suggestions how to write the business logic code in c#.net.

Thanks in Advance.

Posted 15-Jan-13 6:15am

Shekar Raja

Updated 15-Jan-13 17:56pm

v2

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2 solutions

Solution 1

Try CodeProject Frequently Asked Questions Series 1: The ASP.NET GridView[^].

Posted 15-Jan-13 6:28am

Abhinav S

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pryashrma · Accepted Answer · 2013-01-15T18:56:00

Try this

<asp:dropdownlist id="DropDownList1" runat="server" autopostback="true" onselectedindexchanged="DropDownList1_SelectedIndexChanged" >
            <asp:listitem>--select table--</asp:listitem>
            <asp:listitem>Student</asp:listitem>
            <asp:listitem>category</asp:listitem>
            <asp:listitem>logindetails</asp:listitem>
        </asp:dropdownlist>
        <asp:gridview id="GridView1" runat="server" >
        </asp:gridview>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

public partial class Default2 : System.Web.UI.Page
{
    int iSIndex;
    DataSet ds = new DataSet();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            SqlConnection con = new SqlConnection(@"Data Source=VICTORIN11-PC\\SQLEXPRESS;Initial Catalog=db;Integrated Security=True");
            SqlDataAdapter da;
            con.Open();
            for (int i = 1; i < DropDownList1.Items.Count; i++)
            {
                string s = "select * from " + DropDownList1.Items[i].ToString();
                da = new SqlDataAdapter(s, con);
                da.Fill(ds, DropDownList1.Items[i].ToString());
            }
            ViewState["data"] = ds;
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        iSIndex = DropDownList1.SelectedIndex;
        if (iSIndex > 0)
        {
            ds = (DataSet)ViewState["data"];
            GridView1.DataSource = ds.Tables[iSIndex - 1];
            GridView1.DataBind();
        }
        else
        {
            GridView1.DataSource = null;
            GridView1.DataBind();
        }
    }
}