DropDownList5' has a SelectedValue which is invalid

Abdalla Elawad

9y1.4k.NET

Hi Guys

please help me

i use girideview when i update data the dropdownlist of City update null in the value and not display as data bind value

below the code

DataSourceID="SqlDataSource2" DataTextField="City" DataValueField="City"

Width="90" Font-Size="Small" Font-Names="Calibri" >

Selected City

ConnectionString="<%$ ConnectionStrings:Cash_PlanConn %>"

SelectCommand="SELECT City FROM RegionCity2 WHERE (Region = @Region)">

PropertyName="SelectedValue" Type="String" />

ControlToValidate="DropDownList5" Text="*Required" ForeColor="Red">

DataSourceID="SqlDataSource3" DataTextField="City" DataValueField="City"

Width="90" Font-Size="Small" Font-Names="Calibri">

Selected City

ConnectionString="<%$ ConnectionStrings:Cash_PlanConn %>"

SelectCommand="SELECT City FROM RegionCity2 WHERE (Region = @Region)">

PropertyName="SelectedValue" Type="String" />

ControlToValidate="dd_City" Text="*Required" ForeColor="Red">

ERROR :

Grid View:

5 Replies

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Abdalla Elawad9y ago
Thank You

I upload the project , desinged problem in Form1
Ramesh Barik9y ago
Yes,

Dropdownlist4 binds the data for Regions. when the region dropdownlist selected chnaged event fire that time City (dropdownlist5) binds the list of records as per the selected region(Dropdownlist4).

When you bind the dropdownlist5 you have to pass the condtion as the selected value of dropdownlist4.

Lets say:

Select * from CityTable where RegionId= dropdownlist5.selectedValue.tostring();
Can you please share your code where the issue occoured.
Abdalla Elawad9y ago
Hi Mr.Remesh Braik

But i get value form table directly by control ID for exampe i have dropdownlist4 (Region) to Filter DrropDownlist5 (City) i mean that the data alreday get from table through Control ID

THANKS
Ramesh Barik9y ago
This type of issue occoured when you bind a list of records in to a dropdownlist and then you dynamically set the dropdownlist selected value which is not exists in that list.

lets say:

In your dropdowlist you have bind
1 A
2 B
3 C

But in some case you want to set the seleccted value sholud your value. If you set the dropdolist selected value 1 or 2 or 3 then it will work fine. But i you select 4 then this issue will occure.
So please check the value is correct ,which you want to set the dropdownlist.
Bryian Tan9y ago
Is tough to guess what going on without looking at the code behind. Here are a few suggested post/articles to read

http://stackoverflow.com/questions/14584175/how-to-find-control-in-edit-item-template
https://forums.asp.net/t/1468846.aspx?Cannot+FindControl+in+EditItemTemplate+and+the+return+value+is+null
https://www.codeproject.com/Articles/12021/Accessing-the-different-controls-inside-a-GridView