Hi,

I am facing the memory exception in the code given below while creating the
graphis object. Since "ProcessLevelOneData" function is called very
frequently so graphics objects are being created very frequently. We are
also disposing the graphics object at the end of the function.So why are we
getting the error? Please help.

Exception
----------

Type : System.OutOfMemoryException, mscorlib, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Out of memory.
Source : System.Drawing
Help link :
Data : System.Collections.ListDictionaryInternal
TargetSite : System.Drawing.Graphics FromHwndInternal(IntPtr)
Stack Trace :    at System.Drawing.Graphics.FromHwndInternal(IntPtr hwnd)
  at System.Windows.Forms.Control.CreateGraphicsInternal()
  at System.Windows.Forms.Control.CreateGraphics()
  at Nirvana.LiveFeed.LevelOneGrid.ProcessLevelOneData(ArrayList ar)

Code
------

private void ProcessLevelOneData(ArrayList ar)
{

try

{

string symbol;

int rowToUpdate = int.MinValue;

if (grdLevelOne != null)

{

// get the graphics object for the grid

Graphics g = this.grdLevelOne.CreateGraphics();

if (this.grdLevelOne.DisplayLayout != null &&
grdLevelOne.DisplayLayout.UIElement == null)

{

return;

}

// find the row col region intersection so

// we can clip the rendering to this area

UIElement intersection =
this.grdLevelOne.DisplayLayout.UIElement.GetDescendant(typeof(RowColRegionIntersectionUIElement));

if (intersection == null)

{

return;

}

// create an instance of the disposable drawcache class

// this is used to cache pens, brushes, etc. for the

// draw operations that will occur within this tick

// operation

using (DrawCache drawCache = new DrawCache(g, intersection,
AlphaBlendMode.Optimized, false))

{

AppearanceData appearance = new AppearanceData();

// create a single UIElementDrawParams to use for all of the cell

// rendering in this tick operation

UIElementDrawParams drawParams = new UIElementDrawParams(intersection,
drawCache, intersection.Rect, ref appearance, false, false, false);

// store a copy of the original region

// so we can restore the graphics object to

// its original state

using (Region oldRegion = g.Clip)

{

// clip such that the scrollbars, etc. are not

// part of the renderable area

g.IntersectClip(intersection.Rect);

for (int i = 0; i < ar.Count; i++)

{

rowToUpdate = int.MinValue;

Level1Data e = (Level1Data)ar[i];

symbol = e.Symbol.ToString();

// sr.Write(symbol);

if (_symbolList.ContainsKey(symbol.ToUpper().Trim()))

{

if (_symbolRowDict.ContainsKey(symbol))

{

///Update Record

rowToUpdate = int.Parse(_symbolRowDict[symbol].ToString());

}

else

{

///New Record

_symbolRowDict.Add(symbol, this.ultraDataSource1.Rows.Count);

}

GridBindingDelegate d = new GridBindingDelegate(UpdateGrid); //Instantiate a
Delegate To Bind The Grid

this.Invoke(d, new object[] { rowToUpdate, e, g, drawParams }); //Invoke The
Delegate

}

}

}

}

if (g != null)

g.Dispose();

}

_updateStarted = false;

catch (Exception ex)

{

// Invoke our policy that is responsible for making sure no secure
information

// gets out of our layer.

bool rethrow = ExceptionPolicy.HandleException(ex,
Common.POLICY_LOGANDSHOW);

if (rethrow)

{

throw;

}

}

}

Regards,

Rajat.