Ive got this error saying Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)

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Hello programmers, got a problem here as you see i am trying to change vb.net to C#. The problem is that i used developerfusion to convert it. Now ive got a problem on session.
on my code in first page im using vb.net
here is the code

VB

Imports System.Math
Imports System.Web
Imports System.Data.SqlClient
Imports System.Data
Partial Class LOGIN
    Inherits System.Web.UI.Page

    Protected Sub btnLogin_OnClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnLogin.Click
        Dim strSQL As String
        Dim strUserURL As String
        Dim connection As SqlClient.SqlConnection = New SqlClient.SqlConnection("Data Source=ML0003135586;Integrated Security=SSPI;" & "Initial Catalog=TestSQL")
        strSQL = "SELECT * FROM [Tried] " _
                    & "WHERE Username='" & Replace(txtUsername.Text, "'", "''") & "' " _
                    & "AND Password='" & Replace(txtPassword.Text, "'", "''") & "'"
        Dim command As New SqlCommand(strSQL, connection)
        connection.Open()
        strUserURL = command.ExecuteScalar()
        connection.Close()
        If strUserURL <> "" Then
            lblInvalid.Text = ""
            FormsAuthentication.SetAuthCookie(txtUsername.Text, True)
            Session("username1") = txtUsername.Text
            Response.Redirect("Chatroom.aspx")
        Else
            lblInvalid.Text = "Sorry... try again..."
        End If


    End Sub
End Class

on my second page Home I used C#
and got this error

MIDL

Timer1.Tick += new EventHandler(Timer1_Tick);

   callerNames = new AsyncCallingNames(this.RefreshListNames);
   callerMessages = new AsyncCallingMessages(this.RefreshMessages);

   Label1.Text = DateTime.Today.ToString("dd-MMM-yyyy");
   string username = Session["username1"];
   lbluser.Text = username;
   logdata();

Compilation Error <br />

Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)<br />

Plss help. Is Session declaration in C# different in Vb.net?
Thanks and more power

Posted 17-Jul-11 19:25pm

janwel

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Comments

Sergey Alexandrovich Kryukov 18-Jul-11 1:31am

In what line of code? Also, this is self-describing. String is object, but object may or may not be string, so what would you expect?
--SA

3 solutions

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*dan!sh* · Accepted Answer · 2011-07-17T19:29:00

Solution 2

You need to add a ToString method call. Like this:

C#

string username = Session["username1"].ToString();

Edit: You need to add an object to session in page one. Following should help:

In Page1:

Session.Add("Key","Value");

In Page2:

string sessionValue = Convert.ToString(Session["Key"]);

Posted 17-Jul-11 19:29pm

dan!sh

Updated 17-Jul-11 19:38pm

v2

Comments

janwel 18-Jul-11 1:32am

sir how about passing to another page?

dan!sh 18-Jul-11 1:38am

Updated the reply.

janwel 18-Jul-11 2:03am

sir on Session.add("key", "Value"); Sir what will i input say I want the textbox1.text be session is this correct session.add("Textbox1.text","text"); sorry sir im new in C

dan!sh 18-Jul-11 3:34am

Key will be the something that the text represents. I think username in your case. Value will be the value you want to store in the object.

Abhinav S · Accepted Answer · 2011-07-17T19:41:00

Solution 3

Try using

string username = Convert.ToString(Session["username1"]);<br />

If sessionname is null, this will return String.Empty rather than throw an error.

Posted 17-Jul-11 19:41pm

Abhinav S

Updated 17-Jul-11 19:42pm

v3

Parwej Ahamad · Accepted Answer · 2011-07-17T19:28:00

Solution 1

use this code when you retrieving user name:

string username = Convert.ToString(Session["username1"]);
if(!string.IsNullOrWhiteSpace(username))
{
      //Do..
}

Posted 17-Jul-11 19:28pm

Parwej Ahamad

Updated 17-Jul-11 19:38pm

v3

Comments

dan!sh 18-Jul-11 1:32am

Convert.ToString will automatically return empty string if the session value is null.

janwel 18-Jul-11 1:32am

sir how about passing to another page?

walterhevedeich 18-Jul-11 1:40am

What do you mean pass to another page? The user name?

janwel 18-Jul-11 1:50am

yes sir plss help

Abhinav S 18-Jul-11 1:52am

The user name is already in the session. Just access the same object from another page and it should work.

Parwej Ahamad 18-Jul-11 1:53am

First clarify your question? What passing to another page? Do you want to retrieve session value on another page? If yes then do the same way as you are doing on current page.

janwel 18-Jul-11 1:58am

sir i have this other codes for user as you see ive set user as parameters
string strSQL = null;
System.Data.SqlClient.SqlConnection connection = new System.Data.SqlClient.SqlConnection("Data Source=ML0003135586;Initial Catalog=TestSQL;Integrated Security=True");
strSQL = "Select * from [tried] WHERE([Username] = @Username)";

connection.Open();
System.Data.SqlClient.SqlCommand command = new System.Data.SqlClient.SqlCommand(strSQL, connection);
command.Parameters.AddWithValue("@Username", lbluser.Text);
System.Data.SqlClient.SqlDataReader DataReader = command.ExecuteReader();
while (DataReader.Read())
{
lblposition.Text = (DataReader["level"].ToString());
etc
and i want also lblposition to be passed

Parwej Ahamad 18-Jul-11 2:18am

I think first you have to learn basic understanding of Session management and session object instead of asking these question. So search on google or CP you will found many articles.