'Rows' could not be initialized in web control...

[koraykazgan]

Hi there,

I am a C# programmer and want to create a Grid Web Control. I am about to finish the grid except rendering the control. I have a grid class, a row class and a cell class. The Grid contains the rows, and the rows the cells.

For the rows I have created a collection, inherited from CollectionBase. Also I created a collection for the cells in the same way. When I add items to the grid at design time I get the following error:

'Rows' could not be initialized.

I dont know why this happens. Here is the code of the grid control:

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Collections;

namespace Bilsa.BilsaControls
{
public class MegaCell
{
private string m_sText;
public string Text
{
get { return m_sText; }
set { m_sText = value; }
}
}

public class MegaCellCollection : CollectionBase
{
public MegaCell this[int index]
{
get { return ((MegaCell)(List[index])); }
set { List[index] = value; }
}

public int Add(MegaCell item)
{
return List.Add(item);
}

public void Insert(int index, MegaCell item)
{
List.Insert(index, item);
}
}


public class MegaRow
{
private MegaCellCollection m_Cells;

public MegaRow()
{
m_Cells = new MegaCellCollection();
}

[PersistenceMode(PersistenceMode.InnerProperty)]
public MegaCellCollection Cells
{
get { return m_Cells; }
set { m_Cells = value; }
}
}



public class MegaRowCollection : CollectionBase
{
public MegaRow this[int index]
{
get { return ((MegaRow)(List[index])); }
set { List[index] = value; }
}

public int Add(MegaRow item)
{
return List.Add(item);
}

public void Insert(int index, MegaRow item)
{
List.Insert(index, item);
}
}


public class RowEditor : System.ComponentModel.Design.CollectionEditor
{
public RowEditor(Type type) : base(type)
{
}
}

/// <summary>
/// Summary description for MegaGrid.
/// </summary>
[ToolboxData("<{0}:MegaGrid runat=server></{0}:MegaGrid>")]
public class MegaGrid : System.Web.UI.WebControls.WebControl
{
private MegaRowCollection m_Rows;

public MegaGrid()
{
m_Rows = new MegaRowCollection();
}

[Category("Bilsa Properties")]
[Editor(typeof(Bilsa.BilsaControls.RowEditor), typeof(System.Drawing.Design.UITypeEditor))]
[PersistenceMode(PersistenceMode.InnerProperty)]
public MegaRowCollection Rows
{
get { return m_Rows; }
//set { m_Rows = value; }
}

/// <summary>
/// Render this control to the output parameter specified.
/// </summary>
/// <param name="output"> The HTML writer to write out to </param>
protected override void Render(HtmlTextWriter output)
{
output.Write("Mega Grid Render");
}
}
}

Thanks for help,
Bye...