Dynamically Creating controls

[Shiju Poyilil]

Hello EveryBody,
I have a dropdownlist with some values as .net server controls & a button ,
on clicking a button i need to generate the choosen contorl dynamically.

I am giving a small glimpse of my code for your understanding
the aspx page has dropdwon list with values as below.

<asp:DropDownLi st id="DropDownLis t1" runat="server">
<asp:ListItem Value="Label">L abel</asp:ListItem>
<asp:ListItem Value="DropDown List">DropDownL ist</asp:ListItem>
<asp:ListItem Value="DataGrid ">DataGrid</asp:ListItem>
<asp:ListItem Value="DataList ">DataList</asp:ListItem>
<asp:ListItem Value="CheckBox ">CheckBox</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="Table">T able</asp:ListItem>
<asp:ListItem Value="TextBox" >TextBox</asp:ListItem>
<asp:ListItem ></asp:ListItem>
</asp:DropDownLis t>

now the code that gets executed at the click of the button is as follows

i am using the reflection name space

String strCtrlName = DropDownList1.S electedItem.Val ue ;
Response.Write( strCtrlName);

Type tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame ,true) ;
Object obj = Activator.Creat eInstance(tp0;
PlaceHolder.Con trols.Add(new obj );
but i get error at the line " Type
tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame ,true) ; "

error below :

System.SystemEx ception: {"Could not load type
System.Web.UI.W ebControls.Data Grid from assembly TestingDynamicC trl,
Version=1.0.195 0.28617, Culture=neutral , PublicKeyToken= null."}
AssemblyName: "TestingDynamic Ctrl, Version=1.0.195 0.28617, Culture=neutral ,
PublicKeyToken= null"
ClassName: "System.Web.UI. WebControls.Dat aGrid"
Message: "Could not load type System.Web.UI.W ebControls.Data Grid from
assembly TestingDynamicC trl, Version=1.0.195 0.28617, Culture=neutral ,
PublicKeyToken= null."
MessageArg: null
ResourceId: -2146233054
TypeName: "System.Web.UI. WebControls.Dat aGrid"

so could you pls help me out with your expert advices on solving the problem
and generating the control dynamically.

your expert advice would be highly appreciated.

Rgds
Shiju

[Karl Seguin]

When getting the type of a class, you need to specify the assembly, ala:

"System.Web.UI. WebControls.Dro pDownList, System.Web"

Since the "System.Web " assembly is in the GAC, you must also specify the
version, publickeytoken and culture, ala:

"System.Web.UI. WebControls.Lab el, System.Web, Version=1.0.500 0.0,
Culture=neutral , PublicKeyToken= b03f5f7f11d50a3 a"

You can get the information by checking out c:\windows\asse mbly though
it'll be the same for you..

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"Shiju Poyilil" <Sh**********@d iscussions.micr osoft.com> wrote in message
news:0B******** *************** ***********@mic rosoft.com...

Hello EveryBody,
I have a dropdownlist with some values as .net server controls & a button
,
on clicking a button i need to generate the choosen contorl dynamically.

I am giving a small glimpse of my code for your understanding
the aspx page has dropdwon list with values as below.

<asp:DropDownLi st id="DropDownLis t1" runat="server">
<asp:ListItem Value="Label">L abel</asp:ListItem>
<asp:ListItem Value="DropDown List">DropDownL ist</asp:ListItem>
<asp:ListItem Value="DataGrid ">DataGrid</asp:ListItem>
<asp:ListItem Value="DataList ">DataList</asp:ListItem>
<asp:ListItem Value="CheckBox ">CheckBox</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="Table">T able</asp:ListItem>
<asp:ListItem Value="TextBox" >TextBox</asp:ListItem>
<asp:ListItem ></asp:ListItem>
</asp:DropDownLis t>

now the code that gets executed at the click of the button is as follows

i am using the reflection name space

String strCtrlName = DropDownList1.S electedItem.Val ue ;
Response.Write( strCtrlName);

Type tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame
,true) ;
Object obj = Activator.Creat eInstance(tp0;
PlaceHolder.Con trols.Add(new obj );
but i get error at the line " Type
tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame ,true) ;
"

error below :

System.SystemEx ception: {"Could not load type
System.Web.UI.W ebControls.Data Grid from assembly TestingDynamicC trl,
Version=1.0.195 0.28617, Culture=neutral , PublicKeyToken= null."}
AssemblyName: "TestingDynamic Ctrl, Version=1.0.195 0.28617,
Culture=neutral ,
PublicKeyToken= null"
ClassName: "System.Web.UI. WebControls.Dat aGrid"
Message: "Could not load type System.Web.UI.W ebControls.Data Grid from
assembly TestingDynamicC trl, Version=1.0.195 0.28617, Culture=neutral ,
PublicKeyToken= null."
MessageArg: null
ResourceId: -2146233054
TypeName: "System.Web.UI. WebControls.Dat aGrid"

so could you pls help me out with your expert advices on solving the
problem
and generating the control dynamically.

your expert advice would be highly appreciated.

Rgds
Shiju

[Peter Laan]

"Shiju Poyilil" <Sh**********@d iscussions.micr osoft.com> wrote in message
news:0B******** *************** ***********@mic rosoft.com...

Hello EveryBody,
I have a dropdownlist with some values as .net server controls & a button
,
on clicking a button i need to generate the choosen contorl dynamically.

I am giving a small glimpse of my code for your understanding
the aspx page has dropdwon list with values as below.

<asp:DropDownLi st id="DropDownLis t1" runat="server">
<asp:ListItem Value="Label">L abel</asp:ListItem>
<asp:ListItem Value="DropDown List">DropDownL ist</asp:ListItem>
<asp:ListItem Value="DataGrid ">DataGrid</asp:ListItem>
<asp:ListItem Value="DataList ">DataList</asp:ListItem>
<asp:ListItem Value="CheckBox ">CheckBox</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="Table">T able</asp:ListItem>
<asp:ListItem Value="TextBox" >TextBox</asp:ListItem>
<asp:ListItem ></asp:ListItem>
</asp:DropDownLis t>

now the code that gets executed at the click of the button is as follows

i am using the reflection name space

String strCtrlName = DropDownList1.S electedItem.Val ue ;
Response.Write( strCtrlName);

Type tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame
,true) ;
Object obj = Activator.Creat eInstance(tp0;
PlaceHolder.Con trols.Add(new obj );
but i get error at the line " Type
tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame ,true) ;
"

Try adding the full assembly name to the string.
"System.Web.UI. WebControls.Tex tBox, System.Web, Version=1.0.500 0.0,
Culture=neutral , PublicKeyToken= b03f5f7f11d50a3 a"

You can use

TextBox tb = new TextBox();

string tmp = tb.GetType().As semblyQualified Name;

to find out what it is.

Peter

[Shiju Poyilil]

Thanks Peter for the help

"Peter Laan" wrote:

"Shiju Poyilil" <Sh**********@d iscussions.micr osoft.com> wrote in message
news:0B******** *************** ***********@mic rosoft.com...

Hello EveryBody,
I have a dropdownlist with some values as .net server controls & a button
,
on clicking a button i need to generate the choosen contorl dynamically.

I am giving a small glimpse of my code for your understanding
the aspx page has dropdwon list with values as below.

<asp:DropDownLi st id="DropDownLis t1" runat="server">
<asp:ListItem Value="Label">L abel</asp:ListItem>
<asp:ListItem Value="DropDown List">DropDownL ist</asp:ListItem>
<asp:ListItem Value="DataGrid ">DataGrid</asp:ListItem>
<asp:ListItem Value="DataList ">DataList</asp:ListItem>
<asp:ListItem Value="CheckBox ">CheckBox</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="Table">T able</asp:ListItem>
<asp:ListItem Value="TextBox" >TextBox</asp:ListItem>
<asp:ListItem ></asp:ListItem>
</asp:DropDownLis t>

now the code that gets executed at the click of the button is as follows

i am using the reflection name space

String strCtrlName = DropDownList1.S electedItem.Val ue ;
Response.Write( strCtrlName);

Type tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame
,true) ;
Object obj = Activator.Creat eInstance(tp0;
PlaceHolder.Con trols.Add(new obj );
but i get error at the line " Type
tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame ,true) ;
"

Try adding the full assembly name to the string.
"System.Web.UI. WebControls.Tex tBox, System.Web, Version=1.0.500 0.0,
Culture=neutral , PublicKeyToken= b03f5f7f11d50a3 a"

You can use

TextBox tb = new TextBox();

string tmp = tb.GetType().As semblyQualified Name;

to find out what it is.

Peter

[Shiju Poyilil]

Thanks Karl for the speedy reply, it worked for me.

Rgds
Shiju

"Karl Seguin" wrote:

When getting the type of a class, you need to specify the assembly, ala:

"System.Web.UI. WebControls.Dro pDownList, System.Web"

Since the "System.Web " assembly is in the GAC, you must also specify the
version, publickeytoken and culture, ala:

"System.Web.UI. WebControls.Lab el, System.Web, Version=1.0.500 0.0,
Culture=neutral , PublicKeyToken= b03f5f7f11d50a3 a"

You can get the information by checking out c:\windows\asse mbly though
it'll be the same for you..

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"Shiju Poyilil" <Sh**********@d iscussions.micr osoft.com> wrote in message
news:0B******** *************** ***********@mic rosoft.com...

Hello EveryBody,
I have a dropdownlist with some values as .net server controls & a button
,
on clicking a button i need to generate the choosen contorl dynamically.

I am giving a small glimpse of my code for your understanding
the aspx page has dropdwon list with values as below.

<asp:DropDownLi st id="DropDownLis t1" runat="server">
<asp:ListItem Value="Label">L abel</asp:ListItem>
<asp:ListItem Value="DropDown List">DropDownL ist</asp:ListItem>
<asp:ListItem Value="DataGrid ">DataGrid</asp:ListItem>
<asp:ListItem Value="DataList ">DataList</asp:ListItem>
<asp:ListItem Value="CheckBox ">CheckBox</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="RadioBut ton">RadioButto n</asp:ListItem>
<asp:ListItem Value="Table">T able</asp:ListItem>
<asp:ListItem Value="TextBox" >TextBox</asp:ListItem>
<asp:ListItem ></asp:ListItem>
</asp:DropDownLis t>

now the code that gets executed at the click of the button is as follows

i am using the reflection name space

String strCtrlName = DropDownList1.S electedItem.Val ue ;
Response.Write( strCtrlName);

Type tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame
,true) ;
Object obj = Activator.Creat eInstance(tp0;
PlaceHolder.Con trols.Add(new obj );
but i get error at the line " Type
tp=System.Type. GetType("System .Web.UI.WebCont rols."+strCtrlN ame ,true) ;
"

error below :

System.SystemEx ception: {"Could not load type
System.Web.UI.W ebControls.Data Grid from assembly TestingDynamicC trl,
Version=1.0.195 0.28617, Culture=neutral , PublicKeyToken= null."}
AssemblyName: "TestingDynamic Ctrl, Version=1.0.195 0.28617,
Culture=neutral ,
PublicKeyToken= null"
ClassName: "System.Web.UI. WebControls.Dat aGrid"
Message: "Could not load type System.Web.UI.W ebControls.Data Grid from
assembly TestingDynamicC trl, Version=1.0.195 0.28617, Culture=neutral ,
PublicKeyToken= null."
MessageArg: null
ResourceId: -2146233054
TypeName: "System.Web.UI. WebControls.Dat aGrid"

so could you pls help me out with your expert advices on solving the
problem
and generating the control dynamically.

your expert advice would be highly appreciated.

Rgds
Shiju