It's not a headache until you can do without it, but to use the sharepoint's attachment controls can be a pain in you know what. Try the solution below and save your self from same.

~Adding attachment Functionality in a Web Part.

//Attachment Controls

//Add the Attachment Controls in the webpart, the attachment upload is the //control to upload and AttachmentsField displays the list of all attachments

AttachmentButton btnAttach;

AttachmentUpload uploadAttach;

AttachmentsField fieldAttach;

HiddenField hDeleteAttachs;

 

 

protected override void RenderWebPart(HtmlTextWriter output)

{

 

//Add the javascript which will handle the list of attachments that have been //marked as deleted and add them to the Hidden Fiels, Actually its adds the //GUID of the Attachment(the delete attachment function use that)

output.Write("'<'script'>'");

output.Write("function RemoveAttachmentFromServer(guid, bRecycleBinEnabled){");

output.Write("var L_ConfirmDelete_TXT='Are you sure you want to delete this attachment?';");

output.Write("var L_ConfirmRecycle_TXT='Are you sure you want to send this attachment to the site Recycle Bin?';");

output.Write("var strWarning;document.getElementById('"+hDeleteAttachs.ClientID+"').value += guid + ';';");

output.Write("if (bRecycleBinEnabled){");

output.Write(" strWarning=L_ConfirmRecycle_TXT; } else { strWarning=L_ConfirmDelete_TXT; }");

output.Write("if (confirm(strWarning)) {");

output.Write("document.getElementById('idAttachmentsTable').deleteRow(document.getElementById(guid).rowIndex);");

output.Write("document.getElementsByName('attachmentsToBeRemovedFromServer').item(0).value+=guid+';';");

output.Write("if (document.getElementById('idAttachmentsTable').rows.length==0){");

output.Write("document.getElementById('idAttachmentsRow').style.display='none';} }} fuction gotoURL(sURL){window.location=sURL; return false;}");

output.Write("'<'/script'>'");

 

 

//Render all the controls

//Looks simple aah! But remember to include the attachment button in a span //with id “part1”

// Yes, that is required, otherwise keep expermenting…..

//The Attachment Upload control has to be in a control with ID = “idAttachmentRow”

//Replace '<' with <

//P.S. : This is one of the most important aspect

output.Write("’<’td’>’");

output.Write("’<’span id='part1'’>’");

btnAttach.RenderControl(output);

output.Write("’<’/span’>’");

output.Write("’<’/td’>’<’/tr’>’<’tr’>’<’td id='idAttachmentsRow'’>’");

uploadAttach.RenderControl(output);

output.Write("’<’/td’>’<’/tr’>’<’tr’>’<’td’>’");

fieldAttach.RenderControl(output);

output.Write("’<’/td’>’<’/tr’>’");

//Create Controls

protected override void CreateChildControls()

{

//Attachment Controls

btnAttach = new AttachmentButton();

btnAttach.ListId = list.ID;

btnAttach.ControlMode = SPControlMode.New;

btnAttach.Text = "Add Attachment";

this.Controls.Add(btnAttach);

 

fieldAttach = new AttachmentsField();

fieldAttach.ListId = list.ID;

fieldAttach.FieldName = "Attachments";

fieldAttach.ControlMode = SPControlMode.New;

this.Controls.Add(fieldAttach);

 

uploadAttach = new AttachmentUpload();

uploadAttach.ListId = list.ID;

uploadAttach.ControlMode = SPControlMode.New;

this.Controls.Add(uploadAttach);

 

//Hidden Field as mentioned above

hDeleteAttachs = new HiddenField();

hDeleteAttachs.ID = "hHiddenFields";

this.Controls.Add(hDeleteAttachs);

}

 

//Submit ,call attachment functions, First Add then delete

void btnSubmit_Click(object sender, EventArgs e)

{

//That's the way it is

AddAttachments(ref item);

item.Update();

DeleteAttachments(ref list, ref item);

}

 

 

//Delete the Attachments, Function

void DeleteAttachments(ref SPList list, ref SPListItem item)

{

try

{

#region Delete

SPFileCollection files = null;

SPFolder itemFolder = null;

//Get tha Attachment Folder

string strAttchmentFolderURL = item.Attachments.UrlPrefix +"/" + item.ID.ToString();

if (list.RootFolder.SubFolders.Count > 0)

{

if (list.RootFolder.SubFolders["Attachments"] != null)

{

itemFolder = list.RootFolder.SubFolders["Attachments"];

 

}

}

 

 

//Read the hidden field contaning the list of deleted attchments GUID

if (!hDeleteAttachs.Value.Equals(""))

{

string strValue = hDeleteAttachs.Value;

string[] strIDs = strValue.Split(';');

for (int i = 0; i < strID.Length; i++)

{

string strTempID = strIDs[i];

 

//I know there is better way to remove characters

strTempID = strTempID.Replace("{", "");

strTempID = strTempID.Replace("}", "");

 

//Get all the files in Attachment Folder that matches the GUID

#region getFiles

if (itemFolder.SubFolders[strAttchmentFolderURL] != null)

{

files = itemFolder.SubFolders[strAttchmentFolderURL].Files;

}

#endregion

foreach (SPFile file in files)

{

if (strTempID.ToLower().Equals(file.UniqueId.ToString().ToLower()))

{

//Delete the file finally

file.Delete();

break;

}

}

}

}

#endregion

}

catch

{

 

}

}

 

//Add attchments

 

void AddAttachments(ref SPListItem item)

{

try

{

for (int i = 0; i < (Page.Request.Files.Count - 1); i++)

{

try

{

//Get the list of files for attachments

 

HttpPostedFile newAttach = Page.Request.Files[i];

byte[] fileContents = new byte[newAttach.ContentLength - 1];

newAttach.InputStream.Seek(0, System.IO.SeekOrigin.Begin);

newAttach.InputStream.Read(fileContents, 0, newAttach.ContentLength - 1);

System.IO.FileInfo fInfo = new System.IO.FileInfo(newAttach.FileName);

item.Attachments.Add(fInfo.Name, fileContents);

}

catch { continue; }

 

}

}

catch {

 

}

}

 

That’s all folks !