choose mutiple check box in combox

DevWebControl
.............\DevWebControl
.............\.............\DevControl
.............\.............\..........\bin
.............\.............\..........\...\Debug
.............\.............\..........\...\.....\DevControl.dll
.............\.............\..........\...\.....\DevControl.pdb
.............\.............\..........\...\Release
.............\.............\..........\...\.......\DevControl.dll
.............\.............\..........\...\.......\DevControl.pdb
.............\.............\..........\DevControl.csproj
.............\.............\..........\DevControl.DropDownCheckBoxList.bmp
.............\.............\..........\DropDownCheckBoxList.cs
.............\.............\..........\ImageListBox.cs
.............\.............\..........\obj
.............\.............\..........\...\Debug
.............\.............\..........\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
.............\.............\..........\...\.....\DevControl.csproj.FileListAbsolute.txt
.............\.............\..........\...\.....\DevControl.dll
.............\.............\..........\...\.....\DevControl.pdb
.............\.............\..........\...\.....\TempPE
.............\.............\..........\...\Release
.............\.............\..........\...\.......\DesignTimeResolveAssemblyReferencesInput.cache
.............\.............\..........\...\.......\DevControl.csproj.FileListAbsolute.txt
.............\.............\..........\...\.......\DevControl.dll
.............\.............\..........\...\.......\DevControl.pdb
.............\.............\..........\...\.......\TempPE
.............\.............\..........\Properties
.............\.............\..........\..........\AssemblyInfo.cs
.............\.............\..........\Resources
.............\.............\..........\.........\cmb_down.jpg
.............\.............\..........\.........\cmb_up.jpg
.............\.............\..........\.........\DropDownCheckBoxList.js
.............\.............\..........\.........\prefix.jpg
.............\.............\DevWebControl.sln
.............\.............\DevWebControl.suo
.............\.............\WebClient
.............\.............\.........\About.aspx
.............\.............\.........\About.aspx.cs
.............\.............\.........\About.aspx.designer.cs
.............\.............\.........\Account
.............\.............\.........\.......\ChangePassword.aspx
.............\.............\.........\.......\ChangePassword.aspx.cs
.............\.............\.........\.......\ChangePassword.aspx.designer.cs
.............\.............\.........\.......\ChangePasswordSuccess.aspx
.............\.............\.........\.......\ChangePasswordSuccess.aspx.cs
.............\.............\.........\.......\ChangePasswordSuccess.aspx.designer.cs
.............\.............\.........\.......\Login.aspx
.............\.............\.........\.......\Login.aspx.cs
.............\.............\.........\.......\Login.aspx.designer.cs
.............\.............\.........\.......\Register.aspx
.............\.............\.........\.......\Register.aspx.cs
.............\.............\.........\.......\Register.aspx.designer.cs
.............\.............\.........\.......\Web.config
.............\.............\.........\App_Data
.............\.............\.........\bin
.............\.............\.........\...\DevControl.dll
.............\.............\.........\...\DevControl.pdb
.............\.............\.........\...\Resources
.............\.............\.........\...\Scripts
.............\.............\.........\...\.......\jquery-1.6.4.min.js
.............\.............\.........\...\WebClient.dll
.............\.............\.........\...\WebClient.pdb
.............\.............\.........\Default.aspx
.............\.............\.........\Default.aspx.cs
.............\.............\.........\Default.aspx.designer.cs
.............\.............\.........\Global.asax
.............\.............\.........\Global.asax.cs
.............\.............\.........\Images
.............\.........

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