How to convert dataset to int

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ASP.NET

hi,
i am using three tier architecture for search the data and bind to gridview, My code is

DAL:

public DataSet DSet(string Stxt)
   {
       try
       {
           con = new SqlConnection(connect);
           con.Open();
           cmd = new SqlCommand("Search_sp", con);
           cmd.CommandType = CommandType.StoredProcedure;
           cmd.Parameters.AddWithValue("@searchparameter", Stxt);
           da = new SqlDataAdapter(cmd);
           ds = new DataSet();
           da.Fill(ds);
           return ds;
       }
       catch
       {
           throw;
       }
       finally
       {
           con.Close();
       }
   }

BAL:

public int txtsrch(string txtsrch)
    {
        try
        {
            return cfdal.DSet(txtsrch);
        }
        catch
        {
            throw;
        }
        finally
        {
            cfdal = null;
        }
    }

aspx page code:

protected void Button2_Click(object sender, EventArgs e)
   {
       //connection();
       //query = "Search_sp";
       //cmd = new SqlCommand(query, con);
       //cmd.CommandType = CommandType.StoredProcedure;
       //cmd.Parameters.AddWithValue("@searchparameter", txtsearch.Text).ToString();
       //search_grid.DataSource = cmd.ExecuteReader();
       //search_grid.DataBind();

       string stxt = txtsearch.Text;
       search_grid.DataSource = cfbal.txtsrch(stxt);
       search_grid.DataBind();
   }

Here my Problem is it showing Error(can't convert dataset to int) but i don't know how to do it, even though i refer in google still i didn't get proper output,
Thanks for your advice ....