如何将值从下拉列表传递给控制器

Question

我有一个动态dropdrownlist，我想将所选值从下拉列表传递给控制器​​

ModelBEL.cs

public class ModelBEL
{
    public static string exmId { get; set; }
    public static string qus { get; set; }
    public static string ans1 { get; set; }
    public static string ans2 { get; set; }
    public static string ans3 { get; set; }
    public static string ans4 { get; set; }
    public DataSet exmAllData { get; set; }
}

数据库图层类

public class dbEngine
{
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
    SqlCommand cmd = null;
    SqlDataAdapter sda = null;
    DataSet ds = null;

    public DataSet getExamQus()
    {
        sda = new SqlDataAdapter("usp_getAllExam", con);
        ds = new DataSet();
        sda.Fill(ds);
        return ds;
    }
}

查看

<select id="ddl1">
    <option>select</option>
    @for (int i = 0; i < @Model.exmAllData.Tables[0].Rows.Count; i++)
    { 
        <option>@Model.exmAllData.Tables[0].Rows[i][0].ToString()</option>
    }
</select>

我使用下拉列表

@Html.DropDownList("exam", "choose Tournament")

如何将所选值从下拉列表传递给控制器​​