把文件上载到数据库中

Stream sDocStream;
        int docLen;
        string contentType;
        string uploadDocName;
        string loc = "test";
        sDocStream = uploadfile.PostedFile.InputStream;
        docLen = uploadfile.PostedFile.ContentLength;
        uploadDocName = uploadfile.PostedFile.FileName;

        byte[] docBinaryData = new byte[docLen];

        sDocStream.Read(docBinaryData, 0, docLen);
        contentType = "doc";

        String connectionString = ConfigurationSettings.AppSettings["dbconn"].ToString();
        System.Data.SqlClient.SqlConnection sqlConnection = new System.Data.SqlClient.SqlConnection(connectionString);

        string queryString = "INSERT INTO [test] ([Title], [Loc], [contentType], [docLen], [docData]) VALUES (@Title, @Loc, @contentType, @docLen, @docData)";

        System.Data.SqlClient.SqlCommand sqlCommand = new System.Data.SqlClient.SqlCommand(queryString, sqlConnection);


        uploadDocName = uploadDocName.Substring(uploadDocName.LastIndexOf(@"\") + 1);

        sqlCommand.Parameters.Add("@Title", System.Data.SqlDbType.NVarChar).Value = uploadDocName;
        sqlCommand.Parameters.Add("@Loc", System.Data.SqlDbType.NVarChar).Value = loc;
        sqlCommand.Parameters.Add("@contentType", System.Data.SqlDbType.VarChar).Value = contentType;
        sqlCommand.Parameters.Add("@docLen", System.Data.SqlDbType.BigInt).Value = docBinaryData.Length;
        sqlCommand.Parameters.Add("@docData", System.Data.SqlDbType.Image).Value = docBinaryData;

        try
        {
            sqlConnection.Open();
            sqlCommand.ExecuteNonQuery();

        }
        catch (Exception ex)
        {
            Response.Write(ex.Message + "<HR>");
        }
        finally
        {
            sqlConnection.Close();
        }