Need to display excel data in sql database without duplication.

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C#

ASP.NET

Need to display excel data in sql database without duplication..
I have use file upload control in asp.net and a Button.
I need to save the excel data in database on button click event without duplication.

this is my code which is showing an error..

protected void btnsave_Click(object sender, EventArgs e)
    {
        //Create connection string to Excel work book
            string excelConnectionString =
            @"Provider=Microsoft.Jet.OLEDB.4.0;" + 
            "Data Source=/BACKUP C DATA140312/Desktop/pratham/ActiveSub-Brokers" 
            + Server.MapPath("Book1.xls") + ";" + "Extended Properties=Excel 8.0";

            //Create Connection to Excel work book
            OleDbConnection excelConnection =
            new OleDbConnection(excelConnectionString);

            //Create OleDbCommand to fetch data from Excel
            OleDbCommand cmd = new OleDbCommand
            ("Select * from [Book1$]",
            excelConnection);

            excelConnection.Open();
            OleDbDataReader dReader;
            dReader = cmd.ExecuteReader();

            SqlBulkCopy sqlBulk = new SqlBulkCopy(strConnection);
            sqlBulk.DestinationTableName = "tblActiveSubBroker";
            //sqlBulk.ColumnMappings.Add("ID", "ID");
            //sqlBulk.ColumnMappings.Add("Name", "Name");
            sqlBulk.WriteToServer(dReader);
}
}

this shows error

Failure creating file.

Thanks in advance
Pratham