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Asked: 2026-05-22T00:18:03+00:00

I have two dropdownlist, one is State and one is City. When a State

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I have two dropdownlist, one is State and one is City. When a State is selected, the City dropdownlist becomes populated. At that point you can select a city, however if you select a city and go back and select a different state, the city dropdownlist is populated by the cities for both states. How do I get it clear the cities for the first state?

Here is the code behind

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Public Sub ddlState_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
        SqlDataSource2.SelectParameters.Clear()
        SqlDataSource2.SelectParameters.Add(New Parameter("@State", DbType.String, ddlState.SelectedValue))
        ddlCity.DataBind()
        'SqlDataSource2.SelectParameters.Clear()
        'Dim State As String = ddlState.SelectedItem.Text
    End Sub

    Protected Sub ddlCity_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ddlCity.SelectedIndexChanged
        'Dim City As String = ddlCity.SelectedItem.Text
    End Sub
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1 Answer

  1. Editorial Team
     Public Sub ddlState_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)         
   SqlDataSource2.SelectParameters.Clear()         
   SqlDataSource2.SelectParameters.Add(New Parameter("@State", DbType.String, ddlState.SelectedValue))  
   ddlCity.Items.Clear();
   ddlCity.Items.Add(new ListItem("SELECT ONE", ""))  ' If you want it '       
   ddlCity.DataBind()
End Sub

    You could also set AppendDataboundItems = 'false' in the control.

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