Connection string. Cannot implicitly convert 'String' to 'System.Data.SqlClient.SqlConnection' - sql-server

Question

I'm getting that error in title.
For my
cmd.Connection = Conn;
I have this
public string Conn = connection.getConnection();
I'm using a windows application, how do I fix this?
Here is my complete code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace WindowsFormsApplication3
{
public partial class Room : Form
{
public SqlDataReader re;
public string Conn = connection.getConnection();
public Room()
{
InitializeComponent();
}
private void Room_Load(object sender, EventArgs e)
{
..
..
..
}
private void btnAdd_Click(object sender, EventArgs e)
{
try
{
if (textBox1.Text.Length != 0 && textBox2.Text.Length != 0)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = Conn;
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "insertToRoom";
cmd.Parameters.AddWithValue("#room_name", textBox1);
cmd.Parameters.AddWithValue("#room_rate", textBox2);
cmd.ExecuteNonQuery();
}
else
{
MessageBox.Show("Please fill in all the textbox.", "Wrong Input", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}

Answer 1

Try this way. First get the connection string from web.conf or app.conf and then create a sqlconnection to assign to sqlcommand.
var connectionString =
ConfigurationManager.ConnectionStrings["NameofConstringFromWebconfig"].ConnectionString;
SqlCommand cmd = new SqlCommand();
cmd.Connection =new SqlConnection(connectionString);