hi iam creating login page... but it doesn'tgoes to database connection

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hi

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.Configuration;

public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button_Login_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString);
con.Open();
string checkuser = "select count(*) from UserData where [User Name]='" + TextBoxUserName.Text + "'";
SqlCommand com = new SqlCommand(checkuser, con);
int temp = Convert.ToInt32(com.ExecuteScalar().ToString());
con.Close();
if (temp == 1)
{
con.Open();
string checkPasswordQuery = "select password from UserData where [User Name]'" + TextBoxUserName.Text + "'";
SqlCommand passCom = new SqlCommand(checkPasswordQuery, con);
string password = passCom.ExecuteScalar().ToString().Replace(" ","");
if (password == TextBoxPassword.Text)
{
Session["New"] = TextBoxUserName.Text;
Response.Write("Password is correct");
Response.Redirect("Mnager.aspx");
}
else
{
Response.Write("Password is not correct");
}
}
}
}

Posted 28-Feb-14 19:25pm

harshavardhan12345678

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Comments

King Fisher 1-Mar-14 1:27am

getting error?

harshavardhan12345678 1-Mar-14 1:32am

s no error
butdoen'tconnect to database connection

King Fisher 1-Mar-14 2:51am

use try catch block to catch the exception ,and update with exception info.

3 solutions

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Pranav-BiTwiser · Answer 1 · 2014-02-28T19:32:00

Solution 1

con.Open();
string checkuser = "select count(*) from UserData where [User Name]='" + TextBoxUserName.Text + "'";
SqlCommand com = new SqlCommand(checkuser, con);
SqlDatareader dr = com.executereader();
if(dr.read())
{
int temp = dr[0];
}
con.Close();

this will work fine

Posted 28-Feb-14 19:32pm

Pranav-BiTwiser

Comments

harshavardhan12345678 1-Mar-14 1:40am

getting errors....

Error 1 The type or namespace name 'SqlDatareader' could not be found (are you missing a using directive or an assembly reference?) C:\Users\MR002\Documents\Visual Studio 2010\WebSites\LoginWebsite1\Login.aspx.cs 22 9 C:\...\LoginWebsite1\
Error 2 'System.Data.SqlClient.SqlCommand' does not contain a definition for 'executereader' and no extension method 'executereader' accepting a first argument of type 'System.Data.SqlClient.SqlCommand' could be found (are you missing a using directive or an assembly reference?) C:\Users\MR002\Documents\Visual Studio 2010\WebSites\LoginWebsite1\Login.aspx.cs 22 32 C:\...\LoginWebsite1\
Error 3 The name 'temp' does not exist in the current context C:\Users\MR002\Documents\Visual Studio 2010\WebSites\LoginWebsite1\Login.aspx.cs 28 13 C:\...\LoginWebsite1\

Tom Marvolo Riddle 1-Mar-14 1:50am

try this:
SqlCommand com = new SqlCommand(checkuser, con);
SqlDataReader dr = com.ExecuteReader();

harshavardhan12345678 1-Mar-14 1:53am

error is ===Invalid OPeration Exception was Unhandle by user code

There is already an open DataReader associated with this Command which must be closed first.

harshavardhan12345678 1-Mar-14 2:14am

There is already an open DataReader associated with this Command which must be closed first

Tom Marvolo Riddle 1-Mar-14 2:41am

which line?

harshavardhan12345678 1-Mar-14 3:01am

Line 20: string checkuser = "select count(*) from UserData where [User Name]='" + TextBoxUserName.Text + "'";
Line 21: SqlCommand com = new SqlCommand(checkuser, con); SqlDataReader dr = com.ExecuteReader();
Line 22: int temp = Convert.ToInt32(com.ExecuteScalar().ToString());
Line 23: con.Close();
Line 24: if (temp == 1)

k07 · Answer 2 · 2014-02-28T20:03:00

Solution 2

I think your code is correct .Do one thing
Debugg ur code line by line (f11) ,then copy the Checkuser value and run directly from the Sql server.....

Posted 28-Feb-14 20:03pm

k07

Comments

harshavardhan12345678 1-Mar-14 2:16am

There is already an open DataReader associated with this Command which must be closed first

Pranav-BiTwiser · Answer 3 · 2014-02-28T21:31:00

Solution 3

Check whether namespace-- using system.data.sqlclient is added up in namespace or not.....if not...add them

Posted 28-Feb-14 21:31pm

Pranav-BiTwiser

Comments

harshavardhan12345678 1-Mar-14 3:33am

already added