How to read a .csv file using oledb reader when name of the file is too long ?

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C#

C#4.0

OleDb

oleDbConnectionStringBuilder sbConnection = new OleDbConnectionStringBuilder();
sbConnection.DataSource = System.IO.Path.GetDirectoryName(txt_selectDirectory.Text);
sbConnection.Provider = "Microsoft.ACE.OLEDB.12.0";
String strExtendedProperties = String.Empty;
strExtendedProperties = String.Format("Text;IMEX=1;FMT=Delimited", "NO");
sbConnection.Add("Extended Properties", strExtendedProperties);
String filename = System.IO.Path.GetFileName(txt_selectDirectory.Text);
OleDbDataReader datareader;
System.Data.OleDb.OleDbConnection connection = new System.Data.OleDb.OleDbConnection(sbConnection.ToString());
System.Data.OleDb.OleDbCommand command = new System.Data.OleDb.OleDbCommand(String.Format("Select * FROM [{0}]", filename), connection);
connection.Open();
command.CommandTimeout = 0;
datareader = command.ExecuteReader();

No exception is comming for file 546906592003-bla-bla-bla-2014-05.csv
But when file name is long like 546906592003-bla-bla-bla-bla-bla-bla-blabla-bla-blabla-bla-blabla-bla-blabla-bla-blabla-bla-blabla-bla-bla-2014-05.csv
Exception is thrown:
file name is not a valid name. Make sure that it does not include invalid characters or punctuation and that it is not too long