How to select/ check radio button based on the value from database? - asp.net

Question

I have radio button like below
<dx:ASPxRadioButtonList ID="radClaimType" runat="server" RepeatDirection="Horizontal" AutoPostBack="true" ValueType="System.String" Border-BorderStyle="None">
<Items>
<dx:ListEditItem Text="Expenses" Value="1" />
<dx:ListEditItem Text="Travel" Value="2" />
</Items>
</dx:ASPxRadioButtonList>
How do I select/check the radio button based on the value that I have inserted in database ?
Here is my code behind
Dim dt As New Datatable
Dim strSelect As String = "SELECT claim_type FROM detail_table WHERE id = '30'"
Dim myconn As New clsConnection
Try
myconn.OpenConnection()
myconn.FillDataTable(dt, strSelect)
myconn.CloseConnection()
If dt.Rows.Count > 0 Then
If dt.Rows(0).Item("claim_type") = 1 Then
radClaimType.SelectedIndex = 1
ElseIf dt.Rows(0).Item("claim_type") = 2 Then
radClaimType.SelectedIndex = 2
End If
radClaimType.Enabled = False
End If
Catch ex As Exception
MsgBox("Error")
myconn.CloseConnection()
End Try
The result is like this which is incorrect because the claim_type value for id = '30' is 1 which is Expense. I have debug the code and the value for claim_type is indeed 1 but the radio button does not checked/selected to Expense. How do I correct this ?

Answer 1

You should tag what 3rd party control library you are using here.
Anyway, as a general rule, the asp.net RB-list can be set by "index", starting at 0, or you can set by value.
So, for your code, then this:
radClaimType.SelectedValue = dt.Rows(0).Item("claim_type")
You do NOT want to set by index, since the RB list could have ANY values, and
0 = first one
1 = 2nd one
etc. etc. etc.
So, index starts at 0
but, you want to set the RB by "value", and hence:
radClaimType.SelectedValue = dt.Rows(0).Item("claim_type")
You can check your documentaton for that control (I don't have it).
But, you don't need a "if/then" here. You can set the value of the RB, and it should then select/display the value corectly
so with this:
<asp:RadioButtonList ID="RadioButtonList1" runat="server"
RepeatDirection="Horizontal" AutoPostBack="true" >
<asp:ListItem Value="100">Expenses</asp:ListItem>
<asp:ListItem Value="200">Travel</asp:ListItem>
</asp:RadioButtonList>
Then I can set 0 (first) or 1 (second) using "indexing" like this:
RadioButtonList1.SelectedIndex = 0 ' would select the 100
RadioButtonList1.SelectedIndex = 1 ' would select the 200
Or, by value
RadioButtonList1.SelectedValue = 100 ' would select the first one