How to fetch blocked Files in sharepoint using object model ?

Here is a function that return a string which contins all blocked files in sharepoint. The string contins extension of files with a seperator passed to function as parameter.

Class used to fetch the blocked file is :- WebApplication

public static string getBlockedFileExtensions(char chrSeperator)
{
Collection collBlockedFile = SPContext.Current.Site.WebApplication.BlockedFileExtensions;
StringBuilder sb = new StringBuilder();
foreach (string strExt in collBlockedFile)
{
sb.Append(strExt);
sb.Append(chrSeperator);
}
return sb.ToString();
}

Paging for SPList in Sharepoint ?

Many times we want to display data present in SPList into datagrid. However we don't show all record at any time, instead we display limited records in a grid. Here is the code to paginate through SPlist.



private SPListItemCollection getItemCollection(SPList objList, int pageSize, int pageIndex, string strSortFieldName, string strdatatype, bool blAscendingTrueFalse, string strViewFilds, string strQuery)
{
SPQuery spQry = null;

if (pageIndex < 2)
{
spQry = new SPQuery();
spQry.RowLimit = (uint)pageSize;
spQry.ViewFields = strViewFilds;

spQry.Query = strQuery + "<OrderBy><FieldRef Name=\"" + strSortFieldName + "\" Ascending=\"" + blAscendingTrueFalse + "\" /></OrderBy>";

}
else
{
spQry = new SPQuery();
spQry.RowLimit = (uint)((pageIndex - 1) * pageSize);

spQry.ViewFields = "<FieldRef Name='Id'/><FieldRef Name='" + strSortFieldName + "'/>";

spQry.Query = strQuery + "<OrderBy><FieldRef Name=\"" + strSortFieldName + "\" Ascending=\"" + blAscendingTrueFalse + "\" /></OrderBy>";

SPListItemCollection objItemCollection = objList.GetItems(spQry);


spQry = new SPQuery();
spQry.RowLimit = (uint)pageSize;
spQry.ViewFields = strViewFilds;

spQry.Query = strQuery + "<OrderBy><FieldRef Name=\"" + strSortFieldName + "\" Ascending=\"" + blAscendingTrueFalse + "\" /></OrderBy>"; ;

SPListItemCollectionPosition objSPListColPos = null;

if (strdatatype.ToUpper() == "DATETIME")
{
objSPListColPos = new SPListItemCollectionPosition("Paged=TRUE"
+ "&p_" + strSortFieldName + "=" + SPEncode.UrlEncode(System.DateTime.Parse(objItemCollection[objItemCollection.Count - 1][strSortFieldName].ToString()).ToUniversalTime().ToString("yyyyMMdd hh:mm:ss"))
+ "&p_ID=" + objItemCollection[objItemCollection.Count - 1]["ID"].ToString());
}
else
{
objSPListColPos = new SPListItemCollectionPosition("Paged=TRUE"
+ "&p_" + strSortFieldName + "=" + objItemCollection[objItemCollection.Count - 1][strSortFieldName].ToString()
+ "&p_ID=" + objItemCollection[objItemCollection.Count - 1]["ID"].ToString());
}


spQry.ListItemCollectionPosition = objSPListColPos;
}

return objList.GetItems(spQry);
}

Where,
objList = SPlist Object.
pageSize = datagrid pagesize.
pageIndex = PageIndex.
strSortFieldName = Name of Field on which data is sorted.
strdatatype = DataType of sort field (ie strSortFieldName).
blAscendingTrueFalse = Sort type ie. Ascending or descending.
strViewFilds = string containing the view fields.
strQuery = String containing query to fetch results.