uploading a text or doc file to a database

[Grimfort]

Well, one thing stands out, the parameters dont match up:
@filename is a varbinary and you set it to a string (nvarchar instead maybe?)
@filelength is a bigint and you are passing it the docbuffer

I think you want something like this

cmdUploadDoc.Parameters.Add("@Filename ", File1.PostedFile.FileName)
cmdUploadDoc.Parameters.Add("@Filedata*fix*, Docbuffer)
cmdUploadDoc.Parameters.Add("@FileLength", Docbuffer.Length)  
cmdUploadDoc.Parameters.Add("@FileType", File1.PostedFile.ContentType)