error in casting string value to dropdownlist

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Dim ass As System.Reflection.Assembly = System.Reflection.Assembly.GetExecutingAssembly()
Dim page As Type = ass.GetType("pagename")
For Each info As FieldInfo In page.GetFields((BindingFlags.[Public] Or BindingFlags.NonPublic) Or BindingFlags.Instance Or BindingFlags.DeclaredOnly)
If info.FieldType = GetType(System.Web.UI.WebControls.DropDownList) Then
'Dim id As String = info.Name
Dim ddl As DropDownList = DirectCast(info.Name, DropDownList)
error is value of type string cannot convert into System.Web.UI.WebControls.DropDownList
If info.Name <> "_ddlAppNo" Then
If cGlobal.IsValidValue(enmCheck.CDDL, Me, CType(info.Name, System.Web.UI.WebControls.DropDownList), "Select District") = False Then Exit Sub
Console.WriteLine(info.Name.Split("_")(1))
End If

End If
Next

and if any have code for find the id of all dropdownlist within page then plz help me
thanx

Posted 9-Jul-14 20:59pm

chauhanvatsal

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Comments

George Jonsson 10-Jul-14 3:27am

And how would a string be converted into a DropDownList?
Maybe you mean to add items to the list?

chauhanvatsal 10-Jul-14 3:33am

no i am not want to add to the list
i get the string which is my controllId and using that i want to check it's property like it's selected index or value etc....

2 solutions

Solution 2

findout another way to find all control id from page

VB

Public Sub FindAllTextBox(ctrl As Control)
        If ctrl IsNot Nothing Then
            For Each c As Control In ctrl.Controls
                If TypeOf c Is DropDownList Then
                   
                  DO what ever u want
                End If
                FindAllTextBox(c)
            Next
        End If
    End Sub

call it

Dim ctrl As Control = Me
FindAllTextBox(ctrl)

Posted 11-Jul-14 0:08am

chauhanvatsal

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CHill60 · Accepted Answer · 2014-07-10T02:01:00

Solution 1

You need to find the control with the name info.Name
There is a Control.FindControl[^] method.

So in your case it would be something like (warning - untested)

VB

Dim ddl As DropDownList = DirectCast(FindControl(info.Name), DropDownList)

Posted 10-Jul-14 2:01am

CHill60