c# connection With sql

public DataSet ConnectExample()
{
   try
   {
      string theConnectionString = @"Server=" + SERVER + ";Database=" +
      DatabaseName + ";User ID=" + UserName + ";Password=" + Password + 
      ";Trusted_Connection=False;";
      
      //The SQL Statement
      string theSQL = "SELECT * FROM ExampleDatabase";

      //Create Connection
      SqlConnection thisConnection = new SqlConnection(theConnectionString);

      //Create data adapter
      SqlDataAdapter theDataAdapter = new SqlDataAdapter(theSQL, thisConnection);

      //Create DataSet to contain related data tables, rows, and columns
      DataSet thisDataSet = new DataSet();

      //Fill DataSet using query defined previously for DataAdapter
      theDataAdapter.Fill(thisDataSet, "ExampleDB");

      //Close Connection
      thisConnection.Close();

      return thisDataSet;
   }
   catch (Exception ex)
   {
      return null;
   }
}