Connecting C# 4 to excel 12.0 library(excel 2007)

Hi,
I am trying to connect to excel 12.0 from c# 4.0. I use the following code.

Code:

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string excelConnection = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" + txtFile.Text +
                "; Extended Properties=Excel 12.0; HDR=yes;IMEX=1;ImportMixedTypes=Text";
DataTable table = new DataTable();       
      using (OleDbConnection oledbConn = new OleDbConnection(excelConnection)) {
          oledbConn.Open();
          using (OleDbCommand command = new OleDbCommand("Select * from [Sheet1$]", oledbConn)) {
                    OleDbDataReader reader = command.ExecuteReader();
                    table.Load(reader);
            }
    }

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It is compiling good. But in runtime, it produces the error - OleDbException unhandled - Could not find installable ISAM. Please help.