CheckBox List And RadioButtonList

 Cascading DropdownList

if (DropDownList2.SelectedValue == "0")
{
    DropDownList3.SelectedValue = "0";
    DropDownList3.Enabled = false;
}
else
{
    DropDownList3.Enabled = true;
    SqlParameter param = new SqlParameter("@sid", DropDownList2.SelectedValue);
    DataSet ds = new DataSet();
    ds = GetData("usp_city_get", param);
    if (ds.Tables[0].Rows.Count > 0)
    {
        DropDownList3.DataSource = ds;
        DropDownList3.DataBind();
        DropDownList3.Items.Insert(0, new ListItem("--select city--", "0"));
    }
}
protected void Page_Load(object sender, EventArgs e)
{



    if (!IsPostBack)
    {
        Fill_Country();
        DropDownList2.Items.Insert(0, new ListItem("--select state--", "0"));
        DropDownList3.Items.Insert(0, new ListItem("--select city--", "0"));

        DropDownList2.Enabled = false;
        DropDownList3.Enabled = false;
    }
}
public void Fill_Country()
{
    DataSet ds = new DataSet();
    ds = GetData("usp_country_get", null);
    if (ds.Tables[0].Rows.Count > 0)
    {
        DropDownList1.DataSource = ds;
        DropDownList1.DataBind();
        DropDownList1.Items.Insert(0, new ListItem("--select country--", "0"));
    }
}

private DataSet GetData(string SP_Name, SqlParameter param)
{
    SqlDataAdapter da = new SqlDataAdapter(SP_Name, Con);
    da.SelectCommand.CommandType = CommandType.StoredProcedure;
    if (param != null)
    {
        da.SelectCommand.Parameters.Add(param);
    }
    DataSet ds = new DataSet();
    da.Fill(ds);
    return ds;
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{

    if (DropDownList1.SelectedValue == "0")
    {
        DropDownList2.SelectedValue = "0";
        DropDownList2.Enabled = false;
    }
    else
    {
        DropDownList2.Enabled = true;
        SqlParameter param = new SqlParameter("@cid", DropDownList1.SelectedValue);
        DataSet ds = new DataSet();
        ds = GetData("usp_state_get", param);
        if (ds.Tables[0].Rows.Count > 0)
        {
            DropDownList2.DataSource = ds;
            DropDownList2.DataBind();
            DropDownList2.Items.Insert(0, new ListItem("--select state--", "0"));
        }
    }
    DropDownList3.SelectedValue = "0";
    DropDownList3.Enabled = false;
}

CheckBoxList control in ASP.NET:

    Option 1
    Option 2
    Option 3

To access the selected values of the CheckBoxList control in code-behind, you can use the below code.

string selectedValues = string.Empty;
foreach (ListItem item in CheckBoxList1.Items)
{
    if (item.Selected)
    {
        selectedValues += item.Value + ",";
    }
}
selectedValues = selectedValues.TrimEnd(',');

RadioButtonList control in ASP.NET:

    Option 1
    Option 2
    Option 3

To access the selected value of the RadioButtonList control in code-behind, you can use the below code:

tring selectedValue = RadioButtonList1.SelectedValue;

Hello Tarun,

Try this.

For CheckBoxList:

    
Select at least one option:
    
        
        
        
    

For RadioButtonList:

    
Select one option:
    
        
        
        
    

Thanks

Naimish Makwana