在RadioButtonList中选择一个项目，如何从asp.net中的数据库获取到ListBox的项目列表c＃

Question

I have a RadioButtonList and a ListBox . I have bound RadioButtonList to database. Therefore upon selecting an item in the RadioButtonList , I want to retrieve some data into the ListBox . The code I have tried is :

protected void Page_Load(object sender, EventArgs e)
{
   RadioFill();
}

public void RadioFill()
    {
        SqlDataAdapter mydata = new SqlDataAdapter("SELECT DISTINCT Param_Name FROM Parameter_Value_Master", con);
        DataSet dset = new DataSet();
        mydata.Fill(dset, "Table");
        RadioButtonList1.Items.Clear();
        RadioButtonList1.DataSource = dset.Tables[0];
        RadioButtonList1.DataTextField = dset.Tables[0].Columns["Param_Name"].ColumnName;
        RadioButtonList1.DataBind();
    }

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlDataAdapter mydata = new SqlDataAdapter("SELECT Value_Option FROM   Parameter_Value_Master", con);
DataSet dset = new DataSet();
mydata.Fill(dset, "Table");
ListBox1.Items.Clear();
ListBox1.DataSource = dset.Tables[0];
ListBox1.DataTextField = dset.Tables[0].Columns["Value_Option"].ColumnName;
ListBox1.DataBind();
}

The issue I am facing here is upon selecting an item, the whole panel in which I have placed both my RadioButtonList and ListBox goes invisible.

Kindly help...!! Thankyou...!!

Answer 1

First, change Page_Load method as:

protected void Page_Load(object sender, EventArgs e)¨
{
   if (!Page.IsPostBack)
   {
          RadioFill();
   }
}

If it not help than post code from your *.aspx file.

Remark: The method RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e), there is not selecting based on radio button list selected value.