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// If on the fly you want to change the connection string just have a method which would implement something line this
private Connection connect(String database, String table, String username, String password)
private string connectionString = @"Initial Catalog="+database+";" +
@"Data Source="+table+";" +
@"User ID="+username+";" +
SqlConnection connection = new SqlConnection(connectionString);
// Execute commands...
SqlCommand command = new SqlCommand("SELECT * from Itable", connection);
// also make sure to remember to close the connection when you'r done
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