求大神帮忙看一下这是什么问题

Question

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一、单项选择题（共10题，每题2分）
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二、判断题（共10题，每题2分）
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这是前台的代码，下面的是后台的代码

int score = 0;
//int singlemark = int.Parse(((Label)GridView1.Rows[0].FindControl("Label4")).Text);//取出单选题的每题分值
foreach (RepeaterItem rs in Repeater1.Items)//对单选题每题进行判断用户选择答案
{
    string ta = Request.QueryString["tabName"];
    string str = "";
    SqlConnection conn = new SqlConnection();
    conn.ConnectionString = "Data Source=localhost;Initial Catalog=zh;Integrated Security=True";
    // 打开连接
    if (conn.State == ConnectionState.Closed)
    {
        conn.Open();
    }
    if (((RadioButton)rs.FindControl("RadioButton1")).Checked)
    {
        str = "A";
        string aa = ((Label)rs.FindControl("Label1")).Text.Trim();
        string mysql1 = "update "+ ta +" set col8='A' where col1="+aa;
        SqlCommand cmd1 = new SqlCommand(mysql1, conn);
        cmd1.ExecuteNonQuery();
    }
    else if (((RadioButton)rs.FindControl("RadioButton2")).Checked)
    {
        str = "B";
        string aa = ((Label)rs.FindControl("Label1")).Text.Trim();
        string mysql1 = "update " + ta + " set col8='B' where col1=" + aa;
        SqlCommand cmd1 = new SqlCommand(mysql1, conn);
        cmd1.ExecuteNonQuery();
    }
    else if (((RadioButton)rs.FindControl("RadioButton3")).Checked)
    {
        str = "C";
        string aa = ((Label)rs.FindControl("Label1")).Text.Trim();
        string mysql1 = "update " + ta + " set col8='C' where col1=" + aa;
        SqlCommand cmd1 = new SqlCommand(mysql1, conn);
        cmd1.ExecuteNonQuery();
    }
    else if (((RadioButton)rs.FindControl("RadioButton4")).Checked)
    {
        str = "D";
        string aa = ((Label)rs.FindControl("Label1")).Text.Trim();
        string mysql1 = "update " + ta + " set col8='D' where col1=" + aa;
        SqlCommand cmd1 = new SqlCommand(mysql1, conn);
        cmd1.ExecuteNonQuery();
    }
    if (((Label)rs.FindControl("Label3")).Text.Trim() == str)//将用户选择结果和答案进行比较
    {
        score = score + 2;
    }

}
foreach (RepeaterItem dr in Repeater2.Items)//对判断题每题进行判断用户选择答案
{
    string str = "";
    if (((RadioButton)dr.FindControl("RadioButton11")).Checked)
    {
        str = "A";
    }
    else if (((RadioButton)dr.FindControl("RadioButton12")).Checked)
    {
        str = "B";
    }
    if (((Label)dr.FindControl("Label13")).Text.Trim() == str)//将用户选择结果和答案进行比较
    {
        score = score + 2;
    }
    Response.Write(score);
}


    我的repeater2的foreach不执行，求助大神，这是为什么

Answer 1

Repeater2.Items是否为空，下一个断点调试下。