While reading the xl sheet showing errors

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C#

ASP.NET

SQL

MS-Excel

I want to read the data from a xl sheet i wrote the code for that but showing error while executing
the error is following

{"The Microsoft Access database engine cannot open or write to the file 'D:\\Gopi.Ch\\DotNetTasks\\XL Sheet\\XL Sheet\\Files'. It is already opened exclusively by another user, or you need permission to view and write its data."}

my code following

string connString = ConfigurationManager.ConnectionStrings["xls"].ConnectionString;
            // Create the connection object
            OleDbConnection oledbConn = new OleDbConnection(connString);
            try
            {
                string path = @"D:\Gopi.Ch\DotNetTasks\XL Sheet\XL Sheet\File\gopi.xlsx";
                OleDbConnection con_excel = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 8.0");
                OleDbDataAdapter adpt = new OleDbDataAdapter("SELECT Country,State,City,Pincode FROM [Sheet1$]", con_excel);
                DataSet ds = new DataSet();
                adpt.Fill(ds, "tbl_temp");
                DataTable dt = new DataTable();
                dt = ds.Tables["FooTable"];
               /* List<SetData> setData = new List<SetData>();
                foreach (DataRow dr in dt.Rows)
                {

                } */

                gdXlData.DataSource = ds.Tables["tbl_temp"];
                gdXlData.DataBind();
            }
            catch
            {
            }
            finally
            {
                // Close connection
                oledbConn.Close();
            }

What Mistake i did and already installed microsoft oledb 12.0

thanks and regards