asp.net error in mysql

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Data.Odbc;
partial class Poll: System.Web.UI.Page
{

    protected void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack)
	    {
			//lblPollQuestion.Text = "Answer";
  			DisplayPoll();
        }
    }

    private void DisplayPoll()
    {
        try
        {
             DataSet ds = GetActivePoll();
            // ArrayList listCols = new ArrayList();

            //   Displays the poll
             lblPollQuestion.Text = (ds.Tables[0].Rows[0]["Question"]).ToString();

             int i = 0;
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
         
//rdoPollOptionList.Text = dr[0].ToString(); //gives correct value
//rdoPollOptionList.Text = (ds.Tables[0].Columns[0]).ToString(); // gives "PNR"
//rdoPollOptionList.Text =(dr["Answer"]).ToString(); //Gives error, why?
  //rdoPollOptionList.Items[i].Value = dr["PK_OptionId"].ToString();
           
            //foreach ( Column in dtTable.Columns) 

        
          

                rdoPollOptionList.Items.Add(dr["Answer"].ToString());
                rdoPollOptionList.Items[i].Value = dr["PK_OptionId"].ToString();
                rdoPollOptionList.SelectedIndex =0;
   
                i++;
             }
    
        } catch (Exception ex)
        {

	
		// throw ex;
        }
     }
  

       private DataSet GetActivePoll() 
       {
	   try
	   {
       		string  strConnString = (System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"]).ToString();
       		//SqlConnection sqlConn  = new SqlConnection(strConnString);
        
 OdbcConnection MyConnection = new OdbcConnection(strConnString );
    MyConnection.Open();
//SqlClient.SqlConnection sqlConn = new SqlClient.SqlConnection();
//sqlConn.ConnectionString = ("Data Source=C:InetpubwwwrootPollsPollsApp_Data.mdf");
        

        //   Opens the connection
        	//sqlConn.Open();
			OdbcCommand sqlCmd = new OdbcCommand();

        	sqlCmd.CommandText = "{call GetActivePoll}";
        	sqlCmd.CommandType = CommandType.StoredProcedure;
        	sqlCmd.Connection = MyConnection ;
		//   Gets the dataset from the sp
          	DataSet ds = new DataSet();
          	OdbcDataAdapter da = new OdbcDataAdapter(sqlCmd);

        //  Execute stored procedure
        	da.Fill(ds);

        //   Close connection
        	MyConnection.Close();
			return ds;
		} catch (Exception ex)
        {
	
			throw ex;
        }
      }

    protected void btnVote_Click( object sender ,  System.EventArgs e)
    {
        if (Response.Cookies["Voted"]!= null)
         {

            Response.Cookies["Voted"].Value = "Voted";
            Response.Cookies["Voted"].Expires = DateTime.Now.AddDays(1);

            lblError.Visible = false;

            //   Checks if the user can still vote by using cookie
            RecordVote();
         } else
         {
            lblError.Visible = true;
         }
     }

      private void RecordVote()
      {
         string  strConnString= System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
         // SqlConnection sqlConn  = new SqlConnection(strConnString);  
 OdbcConnection MyConnection = new OdbcConnection(strConnString );
    MyConnection.Open();

//SqlClient.SqlConnection sqlConn = new SqlClient.SqlConnection();
//sqlConn.ConnectionString = "Data Source=Ser
          OdbcCommand sqlCmd = new OdbcCommand();

          sqlCmd.CommandText = "{call IncreamentVotes(?)}";
          sqlCmd.CommandType = CommandType.StoredProcedure;
          sqlCmd.Connection = MyConnection;

          //  Creation parameters
          OdbcParameter sqlParamQuestion = new OdbcParameter("@i_OptionId",SqlDbType.Int);

          sqlParamQuestion.Value = rdoPollOptionList.SelectedValue;

          sqlCmd.Parameters.Add(sqlParamQuestion);

          //   Execute stored procedure
         sqlCmd.ExecuteNonQuery();

          //  Close connection
          MyConnection.Close();
      }
}