Radiobutton List Issues

Question

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Hi

I was trying to built online quiz. i put all the question in my DB table i was also

able to successfully render those question and there options (Answers).

But when i am using

RadioButtonList1.Items.Selected / SelectedIndex /SelectedValue / SelectedItem ..

it returns -1 or give null exception .

Where am i going wrong ???

Code is as below

public partial class testpage : System.Web.UI.Page
    {
        public DataTable dt = new DataTable();
        SqlConnection con = new SqlConnection("connectionString");
        
 
        protected void Page_Load(object sender, EventArgs e)
        {
            con.Open();
            SqlCommand cmd = new SqlCommand("select * from table ", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);

            if (dt.Rows.Count > 0)
            {
                Label1.Text = "1." + dt.Rows[0]["Question"].ToString();
                Label2.Text = "2." + dt.Rows[1]["Question"].ToString();
                Label3.Text = "3." + dt.Rows[2]["Question"].ToString();
                Label4.Text = "4." + dt.Rows[3]["Question"].ToString();
                Label5.Text = "5." + dt.Rows[4]["Question"].ToString();
                Label6.Text = "6." + dt.Rows[5]["Question"].ToString();
                Label7.Text = "7." + dt.Rows[6]["Question"].ToString();
                Label8.Text = "8." + dt.Rows[7]["Question"].ToString();
                Label9.Text = "9." + dt.Rows[8]["Question"].ToString();
                Label10.Text = "10." + dt.Rows[9]["Question"].ToString();

               string[] list1 = { dt.Rows[0]["Answer1"].ToString(), dt.Rows[0]["Answer2"].ToString(), dt.Rows[0]["Answer3"].ToString(), dt.Rows[0]["Answer4"].ToString() };
                string[] list2 = { dt.Rows[1]["Answer1"].ToString(), dt.Rows[1]["Answer2"].ToString(), dt.Rows[1]["Answer3"].ToString(), dt.Rows[1]["Answer4"].ToString() };
                string[] list3 = { dt.Rows[2]["Answer1"].ToString(), dt.Rows[2]["Answer2"].ToString(), dt.Rows[2]["Answer3"].ToString(), dt.Rows[2]["Answer4"].ToString() };
                string[] list4 = { dt.Rows[3]["Answer1"].ToString(), dt.Rows[3]["Answer2"].ToString(), dt.Rows[3]["Answer3"].ToString(), dt.Rows[3]["Answer4"].ToString() };
                string[] list5 = { dt.Rows[4]["Answer1"].ToString(), dt.Rows[4]["Answer2"].ToString(), dt.Rows[4]["Answer3"].ToString(), dt.Rows[4]["Answer4"].ToString() };
                string[] list6 = { dt.Rows[5]["Answer1"].ToString(), dt.Rows[5]["Answer2"].ToString(), dt.Rows[5]["Answer3"].ToString(), dt.Rows[5]["Answer4"].ToString() };
                string[] list7 = { dt.Rows[6]["Answer1"].ToString(), dt.Rows[6]["Answer2"].ToString(), dt.Rows[6]["Answer3"].ToString() };
                string[] list8 = { dt.Rows[7]["Answer1"].ToString(), dt.Rows[7]["Answer2"].ToString(), dt.Rows[7]["Answer3"].ToString(), dt.Rows[7]["Answer4"].ToString() };
                string[] list9 = { dt.Rows[8]["Answer1"].ToString(), dt.Rows[8]["Answer2"].ToString(), dt.Rows[8]["Answer3"].ToString() };
                string[] list10 = { dt.Rows[9]["Answer1"].ToString(), dt.Rows[9]["Answer2"].ToString(), dt.Rows[9]["Answer3"].ToString() };

                RadioButtonList1.DataSource = list1;
                RadioButtonList1.DataBind();

                RadioButtonList2.DataSource = list2;
                RadioButtonList2.DataBind();

                RadioButtonList3.DataSource = list3;
                RadioButtonList3.DataBind();

                RadioButtonList4.DataSource = list4;
                RadioButtonList4.DataBind();

                RadioButtonList5.DataSource = list5;
                RadioButtonList5.DataBind();

                RadioButtonList6.DataSource = list6;
                RadioButtonList6.DataBind();

                RadioButtonList7.DataSource = list7;
                RadioButtonList7.DataBind();

                RadioButtonList8.DataSource = list8;
                RadioButtonList8.DataBind();

                RadioButtonList9.DataSource = list9;
                RadioButtonList9.DataBind();

                RadioButtonList10.DataSource = list10;
                RadioButtonList10.DataBind();


            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string result;
            
            string[] Answer = { dt.Rows[0]["Correct_Answer"].ToString(), 
                                dt.Rows[1]["Correct_Answer"].ToString(),
                                dt.Rows[2]["Correct_Answer"].ToString(),
                                dt.Rows[3]["Correct_Answer"].ToString(),
                                dt.Rows[4]["Correct_Answer"].ToString(),
                                dt.Rows[5]["Correct_Answer"].ToString(),
                                dt.Rows[6]["Correct_Answer"].ToString(),
                                dt.Rows[7]["Correct_Answer"].ToString(),
                                dt.Rows[8]["Correct_Answer"].ToString(),
                                dt.Rows[9]["Correct_Answer"].ToString() };
           
                for (int i = 0; i < RadioButtonList1.Items.Count; i++)
                {
                    if (RadioButtonList1.Items[1].Selected)
                    {
                        result = result + 1;
                   }
                }
           

            //for (int i = 0; i < RadioButtonList2.Items.Count; i++)
            //{
            //    if (RadioButtonList2.Items[Convert.ToInt32(Answer[1])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList3.Items.Count; i++)
            //{
            //    if (RadioButtonList3.Items[Convert.ToInt32(Answer[2])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList4.Items.Count; i++)
            //{
            //    if (RadioButtonList4.Items[Convert.ToInt32(Answer[3])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}
            //for (int i = 0; i < RadioButtonList5.Items.Count; i++)
            //{
            //    if (RadioButtonList5.Items[Convert.ToInt32(Answer[4])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList6.Items.Count; i++)
            //{
            //    if (RadioButtonList6.Items[Convert.ToInt32(Answer[5])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList7.Items.Count; i++)
            //{
            //    if (RadioButtonList7.Items[Convert.ToInt32(Answer[6])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList8.Items.Count; i++)
            //{
            //    if (RadioButtonList8.Items[Convert.ToInt32(Answer[7])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList9.Items.Count; i++)
            //{
            //    if (RadioButtonList9.Items[Convert.ToInt32(Answer[8])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //for (int i = 0; i < RadioButtonList10.Items.Count; i++)
            //{
            //    if (RadioButtonList10.Items[Convert.ToInt32(Answer[9])].Selected)
            //    {
            //        result = result + 1;
            //    }
            //}

            //result = result * 10;
            Response.Write(result);
         
        }

    }
}

Posted 4-Jun-12 5:19am

prthpatel412

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Prateesh Nair · Accepted Answer · 2012-06-04T07:45:00

Hi,

I think I figured out your problem. Please try to load your controls in Page load within (!Page.IsPostBack). For e.g. -

ASP

<div>
        <asp:label id="Q1" runat="server" text="" ></asp:label>
        <asp:radiobuttonlist id="RadioButtonList1" runat="server" >
        </asp:radiobuttonlist>
        <asp:label id="A1" runat="server" text="" ></asp:label><br />
        <asp:label id="Q2" runat="server" text="" ></asp:label>
        <asp:radiobuttonlist id="RadioButtonList2" runat="server" >
        </asp:radiobuttonlist>
        <asp:label id="A2" runat="server" text="" ></asp:label><br />
        <asp:label id="Q3" runat="server" text="" ></asp:label>
        <asp:radiobuttonlist id="RadioButtonList3" runat="server" >
        </asp:radiobuttonlist>
        <asp:label id="A3" runat="server" text="" ></asp:label><br />
        <asp:button id="Button1" runat="server" text="Submit" onclick="Button1_Click" />
    </div>

C#

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                DataTable dtQs = PopulateQuestions();
                if (dtQs.Rows.Count > 0)
                {
                    Q1.Text = dtQs.Rows[0][0].ToString();
                    Q2.Text = dtQs.Rows[1][0].ToString();
                    Q3.Text = dtQs.Rows[2][0].ToString();
                    string[] ansQ1 = { dtQs.Rows[0]["Ans1"].ToString(), dtQs.Rows[0]["Ans2"].ToString(), dtQs.Rows[0]["Ans3"].ToString() };
                    string[] ansQ2 = { dtQs.Rows[1]["Ans1"].ToString(), dtQs.Rows[1]["Ans2"].ToString(), dtQs.Rows[1]["Ans3"].ToString() };
                    string[] ansQ3 = { dtQs.Rows[2]["Ans1"].ToString(), dtQs.Rows[2]["Ans2"].ToString(), dtQs.Rows[2]["Ans3"].ToString() };
                    RadioButtonList1.DataSource = ansQ1;
                    RadioButtonList1.DataBind();
                    RadioButtonList2.DataSource = ansQ2;
                    RadioButtonList2.DataBind();
                    RadioButtonList3.DataSource = ansQ3;
                    RadioButtonList3.DataBind();
                }
            }
        }

 protected void Button1_Click(object sender, EventArgs e)
        {
            A1.Text = RadioButtonList1.SelectedItem.Text;
            A2.Text = RadioButtonList2.SelectedItem.Text;
            A3.Text = RadioButtonList3.SelectedItem.Text;
        }