string sqlConnectionString = String.Format(@"Data Source={0};Initial Catalog={1};Integrated Security=True;MultipleactiveResultSets=True",server,database);
string mdbConnectionString = String.Format(@"Provider=microsoft.JET.OLEDB.4.0;data source={0};",@"C:\test\test.mdb");

using (var mdbConnection = new OleDbConnection(mdbConnectionString))
using (var sqlConnection = new SqlConnection(sqlConnectionString))
{
    mdbConnection.Open();
    sqlConnection.Open();

    // Empty table
    var sqlQuery = String.Format("DELETE FROM Languages");
    var sqlCommand = new SqlCommand(sqlQuery,sqlConnection);
    sqlCommand.ExecuteNonQuery();

    // Fill table with new information
    sqlQuery = String.Format("INSERT INTO Languages (ID,lang) " +
                             "SELECT ID,lang " +
                             "FROM OPENrowset('" + mdbConnection.Provider + "','" + mdbConnection.DataSource + "'; 'admin'; '',Languages)");
     sqlCommand = new SqlCommand(sqlQuery,sqlConnection);
     sqlCommand.ExecuteNonQuery();
}

第二个sqlCommand在调用ExecuteNonQuery时引发此错误：

  

System.Data.SqlClient.SqlException：'无法为链接服务器'（null）'创建OLE DB提供程序'microsoft.JET.OLEDB.4.0'的实例。''。''

我想念什么？