repeation when retrieve radiobuttonlist value for editing

I have updated the code. Please put the following code in Reg.aspx.cs file:

 string myconn = ConfigurationManager.ConnectionStrings["RegistrationConnectionString"].ConnectionString;

    private void BindRadioButton()
    {
        using (SqlConnection con = new SqlConnection(myconn))
        {
            string sqlstr = "Select dbo.tblType.Type_ID, dbo.tblType.Type_Name from dbo.tblType";
            con.Open();
            SqlCommand cmd = new SqlCommand(sqlstr, con);
            cmd.CommandType = CommandType.Text;
            cmd.CommandTimeout = 15;

            SqlDataAdapter objDataAdapter = new SqlDataAdapter(cmd);
            DataSet dsType = new System.Data.DataSet(cmd.CommandText);
            objDataAdapter.Fill(dsType, "tblType");
            rdblType.DataTextField = "Type_Name";
            rdblType.DataValueField = "Type_ID";
            rdblType.DataSource = dsType.Tables["tblType"];
            rdblType.DataBind();
        }
    }

    private void GetSelectedValue()
    {
        using (SqlConnection con = new SqlConnection(myconn))
        {
            int regId = 7;
            string sqlstr = string.Format("SELECT dbo.tblType.Type_ID, dbo.tblType.Type_Name FROM dbo.tblReg_Details INNER JOIN dbo.tblType ON dbo.tblReg_Details.Type_ID = dbo.tblType.Type_ID AND ID={0}", regId);
            con.Open();
            SqlCommand cmd = new SqlCommand(sqlstr, con);
            cmd.CommandType = CommandType.Text;
            cmd.CommandTimeout = 15;

            SqlDataReader mySqlDataReader = cmd.ExecuteReader(CommandBehavior.SingleRow);
            while (mySqlDataReader.Read())
            {
                foreach (ListItem litem2 in rdblType.Items)
                {
                    if (litem2.Text == Convert.ToString(mySqlDataReader["Type_Name"]))
                    {
                        litem2.Selected = true;
                        break;
                    }
                }
            }

        }
    }

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


This is working as per your requirement.