未将对象引用设置到对象的实例？？

[ealzero]

未将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。

源错误:


行 24: using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["CarManage"].ConnectionString))
行 25: {
行 26: using (SqlCommand command = new SqlCommand("insert into UserMessage(UserName,UPassword,UCode,UName,USex,UBir,UMZ,USFZ,UPhone,UBuMen,UAddress,UPerMissions) values('" + this.TextBox1.Text + "','" + this.TextBox2.Text + "','" + this.TextBox4.Text + "','" + this.TextBox9.Text + "'," + this.RadioButtonList1.SelectedValue + ",'" + birthday.Value + "','" + DropDownListNation.Items[this.DropDownListNation.SelectedIndex].Text + "','" + this.TextBox5.Text + "','" + this.TextBox6.Text + "','" + this.bumen.Items[this.DropDownListNation.SelectedIndex].Text + "','" + this.TextBox7.Text + "','" + RadioButtonList2.SelectedItem.Text + "')"))
行 27: {
行 28: connection.Open();//打开数据库连接


源文件: f:\CarManage\Register.aspx.cs 行: 26

//源文件
public partial class Register : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
using (SqlConnection connection = new SqlConnection

(ConfigurationManager.ConnectionStrings["CarManage"].ConnectionString))
{
using (SqlCommand command = new SqlCommand("insert into UserMessage

(UserName,UPassword,UCode,UName,USex,UBir,UMZ,USFZ,UPhone,UBuMen,UAddress,UPerMissio

ns) values('" + this.TextBox1.Text + "','" + this.TextBox2.Text + "','" +

this.TextBox4.Text + "','" + this.TextBox9.Text + "'," +

this.RadioButtonList1.SelectedValue + ",'" + birthday.Value + "','" +

DropDownListNation.Items[this.DropDownListNation.SelectedIndex].Text + "','" +

this.TextBox5.Text + "','" + this.TextBox6.Text + "','" + this.bumen.Items

[this.DropDownListNation.SelectedIndex].Text + "','" + this.TextBox7.Text + "','" +

RadioButtonList2.SelectedItem.Text + "')"))
{
connection.Open();
command.Connection = connection;
int result = (int)command.ExecuteNonQuery();
if (result != 0)
{
JScript.AlertAndRedirect("登录成功!", "Login.aspx");

}
else
{
JScript.AlertAndRedirect("登录失败，请重新输入您的用户名和密码！", "#");
}
}
}
}


乞求高手前来赐教

[lbq0801]

哪一句报错，调试去

[SK_Aqi]

那里报的错啊?

[ealzero]

[Quote=引用 2 楼 sk_aqi 的回复:]
那里报的错啊?
[/Quote]
行26 提示--System.NullReferenceException: 未将对象引用设置到对象的实例。

[tony312ws]

你检查下你的参数是不是那个是空的！！

[ealzero]

[Quote=引用 1 楼 lbq0801 的回复:]
哪一句报错，调试去
[/Quote]
行26 有误 有调试下，不知道该如何解决 望高手们能给些点子

[大笨蛋]

[yan267]

this.bumen.Items[this.DropDownListNation.SelectedIndex].Text 

这块是不是写错了？

或者某个控件没有？

[SK_Aqi]

是不是你的item里面没有选中值啊
比如你直接替换:

DropDownListNation.Items[this.DropDownListNation.SelectedIndex].Text

为一个字符试试吧...

[cf370697816]

http://blog.csdn.net/itzhiren/archive/2007/05/23/1621949.aspx

[宝_爸]

八成是在这些地方

DropDownListNation.Items[this.DropDownListNation.SelectedIndex].Text
this.bumen.Items[this.DropDownListNation.SelectedIndex].Text
RadioButtonList2.SelectedItem.Text

26行设置个断点。看看用到的值里哪个是null。

[mangchao330688]

一般都是没取到值，你设断点调试一下，看哪没取到值

[jeje]

调试下下,看你26的值是不是NUll

[勇敢的心515]

对，要学会自己去调试..

[haojuntu]

string con="ConfigurationManager.ConnectionStrings["CarManage"].ConnectionString)";
看一下连接获取到没，进行调试一下。

[子夜__]

检查 using (SqlCommand command = new SqlCommand("insert into UserMessage(UserName,UPassword,UCode,UName,USex,UBir,UMZ,USFZ,UPhone,UBuMen,UAddress,UPerMissions) values('" + this.TextBox1.Text + "','" + this.TextBox2.Text + "','" + this.TextBox4.Text + "','" + this.TextBox9.Text + "'," + this.RadioButtonList1.SelectedValue + ",'" + birthday.Value + "','" + DropDownListNation.Items[this.DropDownListNation.SelectedIndex].Text + "','" + this.TextBox5.Text + "','" + this.TextBox6.Text + "','" + this.bumen.Items[this.DropDownListNation.SelectedIndex].Text + "','" + this.TextBox7.Text + "','" + RadioButtonList2.SelectedItem.Text + "')"))
里有没有空值 用断点。

[hkssy]

[Quote=引用 16 楼 wxr0323 的回复:]

检查 using (SqlCommand command = new SqlCommand("insert into UserMessage(UserName,UPassword,UCode,UName,USex,UBir,UMZ,USFZ,UPhone,UBuMen,UAddress,UPerMissions) values('" + this.TextBox1.Text + "','" + ……
[/Quote]

这样传值好像太不规范了吧，还很容易出错

[a312991915]

26行有的值为空，调试看看