Cannot create an instance of OLE DB provider "MSDASC" for linked server "(null)"

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C#

Hi
I'm Developing an application which will get the excel file from the user and read the data and finally it will store it in sql server 2008.

But it keep on throwing the above error when i try to open a excel file connection.

Here is my code:

protected void btnSave_Click(object sender, EventArgs e)
        {
            string FileName = lblFileName.Text;

            string Extension = Path.GetExtension(FileName);

            string FolderPath = Server.MapPath(ConfigurationManager.AppSettings["FolderPath"]);

            string CommandText = "";

            switch (Extension)
            {

                case ".xls": //Excel 97-03

                    CommandText = "spx_ImportFromExcel03";

                    break;

                case ".xlsx": //Excel 07

                    CommandText = "spx_ImportFromExcel07";

                    break;

            }

            //Read Excel Sheet using Stored Procedure

            //And import the data into Database Table

            String strConnString = ConfigurationManager.ConnectionStrings["CARGONETConnectionString"].ConnectionString;
            SqlConnection con = new SqlConnection(strConnString);
            SqlCommand cmd = new SqlCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = CommandText;
            cmd.Parameters.Add("@SheetName", SqlDbType.VarChar).Value = ddlSheets.SelectedItem.Text;
            cmd.Parameters.Add("@FilePath", SqlDbType.VarChar).Value =FolderPath + FileName;
            cmd.Parameters.Add("@HDR", SqlDbType.VarChar).Value =rbHDR.SelectedItem.Text;
            cmd.Parameters.Add("@TableName", SqlDbType.VarChar).Value = "TB_TransAgentSeaFreightRate";
            cmd.Connection = con;
            try
            {
                con.Open();
                object count = cmd.ExecuteNonQuery();
                lblMessage.ForeColor = System.Drawing.Color.Green;
                lblMessage.Text = count.ToString() + " records inserted.";
            }

            catch (Exception ex)
            {

                lblMessage.ForeColor = System.Drawing.Color.Red;
                lblMessage.Text = ex.Message;

            }

            finally
            {

                con.Close();
                con.Dispose();
                Panel1.Visible = true;
                //Panel2.Visible = false;
                dg_AgentSFR.Visible = true;
            }
           
        }

Anyone please help me.
Thanks in advance.