No mapping exists from object type System.Web.UI.WebControl

Question

i dont know what i did wrong or didnt do but am confused as to how to solve this. please kindly help me out.  when ever i run and try to enter data, its gives me error that " No mapping exists from object type System.Web.UI.WebControl" this is my code.

using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Configuration;

using System.Data.SqlClient;

using System.Text;

using System.Windows;

namespace school_management_solution

{

public partial class WebForm3 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

ddlState.DataSource = GetData("spstate", null);

ddlState.DataBind();

ListItem listate = new ListItem("Select State", "-1");

ddlState.Items.Insert(0, listate);

ListItem lilocal = new ListItem("Select Local Gov", "-1");

ddlLocal.Items.Insert(0, lilocal);

ddlLocal.Enabled = false;

}

}

private DataSet GetData(string Spname, SqlParameter Spparameter)

{

string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

SqlConnection con = new SqlConnection(CS);

SqlDataAdapter da = new SqlDataAdapter(Spname, con);

da.SelectCommand.CommandType = CommandType.StoredProcedure;

if (Spparameter != null)

{

da.SelectCommand.Parameters.Add(Spparameter);

}

DataSet ds = new DataSet();

da.Fill(ds);

return ds;

}

protected void ddlState_SelectedIndexChanged(object sender, EventArgs e)

{

if (ddlState.SelectedIndex == 0)

{

ddlLocal.SelectedIndex = 0;

ddlLocal.Enabled = false;

}

else

{

ddlLocal.Enabled = true;

SqlParameter parameter = new SqlParameter("@ID", ddlState.SelectedValue);

DataSet ds = GetData("spgetlocalbystatid", parameter);

ddlLocal.DataSource = ds;

ddlLocal.DataBind();

}

}

protected void Button2_Click(object sender, EventArgs e)

{

string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

SqlConnection con = new SqlConnection(cs);

SqlCommand cmd = new SqlCommand("INS_Registration", con);

cmd.CommandType = CommandType.StoredProcedure;

SqlParameter Registration_ID = new SqlParameter("@Registration_ID", txtReg_ID);

SqlParameter Surname = new SqlParameter("@Surname", txtSurname.Text);

SqlParameter Last_name = new SqlParameter("@Last_Name", txtLast_name.Text);

SqlParameter Other_Name = new SqlParameter("@Other_Name", txtOther_Name.Text);

SqlParameter Date_Of_Birth = new SqlParameter("@Date_Of_Birth", txtDate_Birth.Text);

SqlParameter sex = new SqlParameter ("@Sex", rdbMale.);

SqlParameter Address = new SqlParameter ("@Address", txtAddress.Text);

SqlParameter Nationality = new SqlParameter("@Nationality", txtNationality.Text);

SqlParameter State_Origin = new SqlParameter("@State_Origin", ddlState.SelectedItem.ToString());

SqlParameter Local_govt = new SqlParameter("@Local_govt", ddlLocal.SelectedItem.ToString());

SqlParameter Phone_Number = new SqlParameter("@Phone_Number", txtPhone_Number.Text);

SqlParameter E_mail = new SqlParameter("@E_mail", txtE_mail.Text);

SqlParameter Picture = new SqlParameter("@Picture", PicturePre);

cmd.Parameters.Add(Registration_ID);

cmd.Parameters.Add(Surname);

cmd.Parameters.Add(Last_name);

cmd.Parameters.Add(Other_Name);

cmd.Parameters.Add(Date_Of_Birth);

cmd.Parameters.Add(sex);

cmd.Parameters.Add(Address);

cmd.Parameters.Add(Nationality);

cmd.Parameters.Add(State_Origin);

cmd.Parameters.Add(Local_govt);

cmd.Parameters.Add(Phone_Number);

cmd.Parameters.Add(E_mail);

cmd.Parameters.Add(Picture);

try

{

con.Open();

cmd.ExecuteNonQuery();

lblReport.Text = "Registration Inserted Complete";

}

catch(Exception ex)

{

lblReport.Text = ex.Message;

con.Close();

}

}

}

}