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Insert data ifnot exits

Posted By:satyapriyanayak       Posted Date: October 31, 2013    Points: 40    Category: Visual Studio    URL: http://www.dotnetspark.com  

We will know while inserting the same data it will display a message (Sorry! you can't take this). If we enter different data then it will display a message (You can take this) and data will be enter into the database.

Table creation

create table employee (eid int primary key identity,ename varchar(50),eaddress varchar(50))

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Insert_data_ifnot_exits._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:Button ID="Button1" runat="server" Text="Availability of name from the database"
        BackColor="#FF99FF" Font-Bold="True" Width="329px"
        onclick="Button1_Click" /><br />
    <asp:Label ID="Labelcheck"  Text="Ename" runat="server" BackColor="#FFFF99"
        Width="197px" ForeColor="#FF3300"></asp:Label>
        <asp:TextBox ID="txtUserName" runat="server" Width="197px"></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
        ControlToValidate="txtUserName" ErrorMessage="*Name Required"></asp:RequiredFieldValidator><br />
        <asp:Label ID="Label1"  Text="Eaddress" runat="server" BackColor="#FFFF99"
        Width="197px" ForeColor="#FF3300"></asp:Label>
        <asp:TextBox ID="txtUserAddress" runat="server" Width="197px"></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
        ControlToValidate="txtUserAddress" ErrorMessage="*Address Required"></asp:RequiredFieldValidator>
    <br />
    <asp:Label ID="lblMessage" runat="server" BackColor="#FF3300"
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 Insert_data_ifnot_exits
    public partial class _Default : System.Web.UI.Page
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
        string str = null;

        protected void Button1_Click(object sender, EventArgs e)

        public void namecheck()
            SqlConnection con = new SqlConnection(connStr);
            str = "select count(*)from employee where ename='" + txtUserName.Text + "'";
            com = new SqlCommand(str, con);
            int count = Convert.ToInt32(com.ExecuteScalar());
            if (count > 0)
                lblMessage.Text = "Sorry! you can't take this username";
                lblMessage.Text = "You can take this username";
                str = "insert into employee(ename,eaddress) values('" + txtUserName.Text + "','" + txtUserAddress.Text + "')";
                com = new SqlCommand(str, con);



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