prob in Dropdownlist

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ASP.NET4

i have 3 dropdownlist in my aspx page.


I have given auto postback =true to my dropdownlists....

when selecting the value from dropdownlist,

that time pwd and confirm pwd columns are going to blank in my aspx page....

afterthat,
even if i give all the columns correctly ,, Gender(Radiobutton) which is not supplied in the current context....

Like that i am receiving the error msg....


How to solve.....

please help me friends....


coding

create proc [dbo].[SP_GetContinent]
as
begin
select Continentid,Continentname from dbo.tblcontinents
end

create proc [dbo].[SP_GetCountriesByContinentID]
@Continent_id int
as
begin
select Countryid,Countryname from dbo.tblCountry where Continent_id =@Continent_id
end

create proc [dbo].[SP_GetStatesByCountry]
@Country_id int
as
begin
select Stateid,Statename from dbo.tblState where Country_id =@Country_id
end

<tr>
                <td class="style3">
                    <asp:Label ID="Label11" runat="server" Text="Continent" CssClass="style2"></asp:Label>
                </td>
                <td>
                    <asp:DropDownList ID="DDL_Continent" runat="server" Width="150px"
                        DataTextField="Continentname" DataValueField="Continentid" AutoPostBack="true"
                        onselectedindexchanged="DDL_Continent_SelectedIndexChanged" TabIndex="10">
                    </asp:DropDownList>
                </td>
                <td>
                    &nbsp;</td>
            </tr>
            <tr>
                <td class="style3">
                    <asp:Label ID="Label12" runat="server" Text="Country" CssClass="style2"></asp:Label>
                </td>
                <td>
                    <asp:DropDownList ID="DDL_Country" runat="server" Width="150px"
                        DataTextField="Countryname" DataValueField="Countryid"
                        onselectedindexchanged="DDL_Country_SelectedIndexChanged" TabIndex="11" AutoPostBack="true">
                    </asp:DropDownList>
                </td>
                <td>
                    &nbsp;</td>
            </tr>
            <tr>
                <td class="style3">
                    <asp:Label ID="Label13" runat="server" Text="City" CssClass="style2"></asp:Label>
                </td>
                <td>
                    <asp:DropDownList ID="DDL_City" runat="server" Width="150px"
                        DataTextField="Statename" DataValueField="Stateid"  TabIndex="12" AutoPostBack="true">

                    </asp:DropDownList>
                </td>
                <td>
                    &nbsp;</td>
            </tr>




when i select the dropdownlist item, password and confirm password textboxes goes to blank.. and then if i try to insert the value in the aspx page...


public void insert(property_Register _PRo)
    {
        con.Open();
        cmd = new SqlCommand("SP_User_Register_Insert", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@FirstName", _PRo.FName);
        cmd.Parameters.AddWithValue("@LastName", _PRo.LName);
        cmd.Parameters.AddWithValue("@UserName", _PRo.UName);
        cmd.Parameters.AddWithValue("@Password", _PRo.Pwd);
        cmd.Parameters.AddWithValue("@Gender", _PRo.Gender);
        cmd.Parameters.AddWithValue("@Education", _PRo.Education);
        cmd.Parameters.AddWithValue("@Techinical", _PRo.Tech);
        cmd.Parameters.AddWithValue("@Relocation", _PRo.Reloc);
        cmd.Parameters.AddWithValue("@FavColor", _PRo.FavColor);
        cmd.Parameters.AddWithValue("@Continent", _PRo.Continent);
        cmd.Parameters.AddWithValue("@Country", _PRo.Country);
        cmd.Parameters.AddWithValue("@City", _PRo.City);
        cmd.Parameters.AddWithValue("@Mail", _PRo.MailID);
        cmd.Parameters.AddWithValue("@Mob", _PRo.Mobno);
        cmd.ExecuteNonQuery();
        con.Close();

    }

I am getting error like this


Procedure or function 'SP_User_Register_Insert' expects parameter '@Gender', which was not supplied.