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Dynamic increment using Dropdownlist

Posted By:satyapriyanayak       Posted Date: November 14, 2013    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

We will know how to increment id dynamically in Dropdownlist after successfully inserting records into database.
 

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Dynamic_increment_using_Dropdown._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <asp:Label ID="Label1" runat="server" Text="EmpId" Font-Bold="True"
            Width="100px"></asp:Label>
    <asp:DropDownList ID="DropDownList1" runat="server"/><br />
    <asp:Label ID="Label2" runat="server" Text="EmpName" Font-Bold="True" Width="100px"></asp:Label>
    <asp:TextBox ID="txt_empname" runat="server"></asp:TextBox><br />
    <asp:Label ID="Label3" runat="server" Text="Salary" Font-Bold="True" Width="100px"></asp:Label>
    <asp:TextBox ID="txt_sal" runat="server"></asp:TextBox><br />
    </div>
   
    <asp:Button ID="btn_insert" runat="server" onclick="btn_insert_Click"
        Text="Insert Data" /><br />
    <asp:Label ID="Label4" runat="server"></asp:Label>
    </form>
</body>
</html>


Default.aspx.cs


using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace Dynamic_increment_using_Dropdown
{
    public partial class _Default : System.Web.UI.Page
    {
        string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string str;
        SqlCommand com;
        int count;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DropDownList1.Items.Add("Select");
                SqlConnection con = new SqlConnection(strConnString);
                str = "select count(*) from employee";
                com = new SqlCommand(str, con);
                con.Open();
                count = Convert.ToInt16(com.ExecuteScalar()) + 1;
                DropDownList1.Items.Add("E00" + count);
                con.Close();
            }
           
        }

        protected void btn_insert_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(strConnString);
            con.Open();
            str = "insert into employee values('" + DropDownList1.SelectedItem.Text.Trim() + "','" + txt_empname.Text.Trim() + "'," + txt_sal.Text.Trim() + ")";
            com = new SqlCommand(str, con);
            com.ExecuteNonQuery();
            con.Close();
            Label4.Text = "Records successfully Inserted";
        }
    }
}



     

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