我在数据库中的表中使用了以下结构。我无法在数据库中上传超过 1mb 的文件，请帮忙看看是什么问题。
fileid(int), FileName(varchar(100)), ContentType (varchar(75)), data varbinary(MAX)
protected void btnUpload_Click(object sender, EventArgs e)
{
// Read the file and convert it to Byte Array
string filePath = FileUpload1.PostedFile.FileName;
string filename = Path.GetFileName(filePath);
string ext = Path.GetExtension(filename);
string contenttype = String.Empty;
//Set the contenttype based on File Extension
switch (ext)
{
case ".doc":
contenttype = "application/vnd.ms-word";
break;
case ".docx":
contenttype = "application/vnd.ms-word";
break;
case ".xls":
contenttype = "application/vnd.ms-excel";
break;
case ".xlsx":
contenttype = "application/vnd.ms-excel";
break;
case ".jpg":
contenttype = "image/jpg";
break;
case ".png":
contenttype = "image/png";
break;
case ".gif":
contenttype = "image/gif";
break;
case ".pdf":
contenttype = "application/pdf";
break;
}
if (contenttype != String.Empty)
{
Stream fs = FileUpload1.PostedFile.InputStream;
BinaryReader br = new BinaryReader(fs);
Byte[] bytes = br.ReadBytes((Int32)fs.Length);
//insert the file into database
Transmittallistfortest transmittalList = (Transmittallistfortest)DetailsView1.FindControl("Transmittallistfortest1");
GridView g3 = transmittalList.FindControl("GridViewTtransmittals") as GridView;
foreach (GridViewRow di in g3.Rows)
{
if (di.RowType == DataControlRowType.DataRow)
{
RadioButton rad = di.FindControl("RadioButton1") as RadioButton;
//Giving Error:Object reference not set to an instance of an object.
rad.CheckedChanged += new EventHandler(MyCheckedChangeEventHandler);
if (rad != null && rad.Checked)
{
var w = di.RowIndex;
string s = ((HyperLink)di.Cells[1].Controls[0]).Text;
var tr = from transmittal in _DataContext.tbltransmittalNos
where transmittal.TRANSMITTAL == s
select transmittal.TransID;
int _transid = tr.SingleOrDefault();
// int _transid = Convert.ToInt32(tr.SingleOrDefault());
Label1.Text = _transid.ToString();
Label2.Text = s;
}
}
}
tblFile fn = new tblFile();
fn.DocId = _DocID;
fn.TransId = Convert.ToInt32(Label1.Text);
fn.FileName = filename;
fn.ContentType = contenttype;
fn.Data = bytes;
// BookAuthor bookAuthor = new BookAuthor();
_DataContext.tblFiles.InsertOnSubmit(fn);
_DataContext.SubmitChanges();
//doctranscon.TransmitToConid = Convert.ToInt32(ddlTransmittaltoCon.SelectedValue);
lblMessage.ForeColor = System.Drawing.Color.Green;
lblMessage.Text = "File Uploaded Successfully";
// Update display
DisplayDocument();
}
}