Sql logic error or missing database

Add the sqlite Database to some path for example C:\\Users\\data\\test.db and use following code,

public void connect()
{
SQLiteConnection sqlite_conn=new SQLiteConnection();
SQLiteCommand sqlite_cmd = new SQLiteCommand();
SQLiteDataReader sqlite_datareader;
//string connstr = "Data Source=dbVkcaddin.db;Version=3;New=False;Compress=True;";
//sqlite_conn.ConnectionString = connstr;
string fullPath = "C:\\Users\\data\\test.db";
SQLiteConnection conread = new SQLiteConnection("Data Source=" + fullPath);
sqlite_conn.Open();
sqlite_cmd.CommandText = "SELECT * FROM Client_contact";
sqlite_cmd.Connection = sqlite_conn;
sqlite_datareader = sqlite_cmd.ExecuteReader();
while (sqlite_datareader.Read()) // Read() returns true if there is still a result line to read
{
string myreader = sqlite_datareader.GetString(0);
MessageBox.Show(myreader);
}
// We are ready, now lets cleanup and close our connection:
sqlite_conn.Close();
}