import data from excel2007 sheet to slserver 2008 table in C#

i am in the way of developing window based application in C#, sqlserver 2008. ud u advice me w cn i import exel 2007 data to sql server. while i am using the followin code i got the exception like  cannot update , database or object is read only

my code is

public void importDataFromExcel(string excelFilePath)
        {

            //Declare Variables - Edit these based on your particular situation

            string sSQLTable = "Branch";

            // make sure your sheet name is correct, here sheet name is Sheet1, so you can change your sheet name if have different

            string myExcelDataQuery = "Select code,name from [Bran$]";

            try
            {

                //Create our connection strings

                string sExcelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + excelFilePath + ";Extended Properties=Excel 8.0";


               
                string sSqlConnectionString = "Initial catalog=accademic;Data Source=.;Integrated Security=true";

                //Execute a query to erase any previous data from our destination table

                string sClearSQL = "DELETE FROM " + sSQLTable;

                //SqlConnection SqlConn = new SqlConnection(sSqlConnectionString);

                con = new SqlConnection(sSqlConnectionString);
                //con.Open();

                SqlCommand SqlCmd = new SqlCommand(sClearSQL, con);

                con.Open();

                SqlCmd.ExecuteNonQuery();

                con.Close();

                //Series of commands to bulk copy data from the excel file into our SQL table

                OleDbConnection OleDbConn = new OleDbConnection(sExcelConnectionString);
                MessageBox.Show ( OleDbConn.State.ToString());

                OleDbCommand OleDbCmd = new OleDbCommand(myExcelDataQuery, OleDbConn);

                OleDbConn.Open();

                OleDbDataReader dr = OleDbCmd.ExecuteReader();

                SqlBulkCopy bulkCopy = new SqlBulkCopy(sSqlConnectionString);//

                bulkCopy.DestinationTableName = sSQLTable;

                while (dr.Read())
                {

                    bulkCopy.WriteToServer(dr);

                }

                OleDbConn.Close();

            }

            catch (Exception ex)
            {
                MessageBox.Show (ex.ToString());

            }