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Database not working after publishing website on IIS - C# Web Services

Hope you're doing well!
I will try to be brief,
I made a web service called "Contacts.asmx" that have this code:
[WebMethod]
public DataTable GetContacts()
{
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand("SELECT * FROM Customers"))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
dt.TableName = "Customers";
sda.Fill(dt);
return dt;
}
}
}
}
and and I have this code in my web.config
<add name="constr" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\user\Desktop\InternetApp\Folder\database.mdf;Integrated Security=True;Connect Timeout=30" providerName="System.Data.SqlClient"/>
Seems to be working fine and i'm getting the XML when i click invoke.
But after publishing website on IIS : http://localhost/Contacts, i'm having this problem:
What should i do?

SSIS Script Task Error. Fill: SelectCommand.Connection property has not been initialized

I have been attempting this several different ways based on searches I have found online but am having the same result.
I am working on an SSIS Script Task that will execute a stored procedure that needs a TVP parameter to be passed into it. I have all that wired up and working properly, but when it gets to the da.Fill(resultDT)
I get the error:
Fill: SelectCommand.Connection property has not been initialized.
OleDbDataAdapter A = new OleDbDataAdapter();
DataTable dt = new DataTable();
A.Fill(dt, Dts.Variables["User::Companies"].Value);
DataTable resultDT = new DataTable();
using (SqlConnection sqlcon = (SqlConnection)(Dts.Connections["RegistryConnection"].AcquireConnection(Dts.Transaction) as SqlConnection))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.Connection = sqlcon;
cmd.CommandText = "[Registry].[GetClientData_ByCompanyIDs]";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#companyIDs", dt);
using (SqlDataAdapter da = new SqlDataAdapter())
{
da.SelectCommand = cmd;
da.Fill(resultDT);
Dts.Variables["User::Clients"].Value = resultDT;
}
}
}
Any ideas what I am missing? Hoping it's something easy that I am overlooking.

Issue was that I was using an OLEDB Connection Manager, which apparently cannot be cast to an SQLConnection in the way I was doing it.
Needed to setup ADO.Net Connection Manager and then the SQLConnection cast worked as intended.
Problem Solved.

Unable to load OleDbDataReader to DataTable

I am reading data from MS access 2010 file. I am using OleDbDataReader to read the data which is working but when I am unable to load that in DataTable .
Code:
DataTable dt = new DataTable();
string connectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\My Stuff\AjaxTest & Test porjects\WbsiteWithAccessDataConnectivity\WbsiteWithAccessDataConnectivity\App_Data\Northwind 2010.accdb";
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
using (OleDbCommand cmd = new OleDbCommand("Select * from Customers", conn))
{
using (OleDbDataReader rd = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
{
dt.Load(rd); // Unable to load
rd.Close();
}
conn.Close();
}
}
return dt;
Any suggestions?

I'm not exactly sure if you are getting an error or what is happening with your code but my suggestion would be to add LoadOption and/or errorHandler parameters to find out exactly what is happening.
dt.Load(rd,OverwriteChanges); // Unable to load
More info here. https://msdn.microsoft.com/en-us/library/hsze9wte%28v=vs.110%29.aspx

The connection's current state is connecting

I am writing web application in C#, and database is MSSQL Express 2012.
When i use SqlDataAdapter i get the Error:
ExecuteReader requires an open and available Connection.
The connection's current state is connecting.
SqlDataAdapter da = new SqlDataAdapter(sql, sqlConn);
da.Fill(dt);
I can not figure how to fix it. Thankss

Try this :
lock(conn)
{
DataTable dt = new DataTable();
using (SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sqlCommand))
{
sqlDataAdapter.Fill(dt);
}
}

C# -> Retrieving dataset from SQL Server 2008

I have a table called NAMES in my SQL Server database. I am trying to retrieve the entire table and put it into a dataset:
//get the connection string from web.config
string connString = ConfigurationManager.ConnectionStrings["Platform"].ConnectionString;
DataSet dataset = new DataSet();
using (SqlConnection conn = new SqlConnection(connString))
{
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = new SqlCommand("NAMES", conn);
adapter.Fill(dataset);
}
This throws a sql exception though,
"Invalid Object Name NAMES"...
What am I doing wrong?

Open the connection !!!!!!
//get the connection string from web.config
string connString = ConfigurationManager .ConnectionStrings["Platform"].ConnectionString;
DataSet dataset = new DataSet();
using (SqlConnection conn = new SqlConnection(connString))
{
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = new SqlCommand("select * from [NAMES]", conn);
conn.Open();
adapter.Fill(dataset);
}

You're not passing an actual SQL select command to the SqlCommand constructor.

First check whether Select * from dbo.[Names] is wroking in ur sql ?
string connString = ConfigurationManager .ConnectionStrings["Platform"].ConnectionString;
Dataset ds=new Dataset();
SqlConnection con = new Sqlconnection(connString);
SqlDataAdapter adapter = new SqlDataAdapter("Select * from dbo.[Names]",con);
adapter.Fill(ds);