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Dynamically creating autogenerated id in textbox at runtime

Posted By:satyapriyanayak       Posted Date: May 25, 2013    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

Here we will create autogenerated id in textbox at runtime dynamically. So that user does not required to fill this.

Here we will create autogenerated id in textbox at runtime dynamically. So that user does not required to fill this.

Table Creation

Create table employee(empid varchar(50) primary key,empname varchar(50),sal int)

Default.aspx code

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_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>
    <form id="form1" runat="server">
        <asp:Label ID="Label1" runat="server" Text="EmpId" Font-Bold="True"
    <asp:TextBox ID="txt_empid" runat="server"></asp:TextBox><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 />
    <asp:Button ID="btn_insert" runat="server" onclick="btn_insert_Click"
        Text="Insert Data" /><br />
    <asp:Label ID="Label4" runat="server"></asp:Label>

Default.aspx.cs code

using System;
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;
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)
        SqlConnection con = new SqlConnection(strConnString);
        str = "select count(*) from employee";
        com = new SqlCommand(str, con);
        count = Convert.ToInt16(com.ExecuteScalar()) + 1;
        txt_empid.Text = "E00" + count;
    protected void btn_insert_Click(object sender, EventArgs e)
        SqlConnection con = new SqlConnection(strConnString);
        str = "insert into employee values('" + txt_empid.Text.Trim() + "','" + txt_empname.Text.Trim() + "'," + txt_sal.Text.Trim() + ")";
        com = new SqlCommand(str, con);
        Label4.Text = "Records successfully Inserted";


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