report1.Load(...); 
// do it after loading the report, before running it
// assume we have one connection in the report
report1.Dictionary.Connections[0].ConnectionString = my_connection_string;
report1.Show();

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[MyParameter]

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report1.SetParameterValue("MyParameter", my_connection_string);

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private void environmentSettings1_DatabaseLogin(
  object sender, DatabaseLoginEventArgs e)
{
  e.ConnectionString = my_connection_string;
}

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請記住，數據庫登錄事件是全局性的，它適用于所有報告。

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