关于wingform窗体间传值的问题，有图，应该不难在线求指点！！…

网上查了，说是用全局变量
public class GlobalInfo
{ public static string username;
}
在登陆成功时保存登录身份
GlobalInfo.username = radioButton1.Text;
但在主界面窗口
textBox1.Text = GlobalInfo.username;


@◇蝴蝶ぢ 这样写对吗？
public partial class 登录窗口 : Form
{
public class GlobalInfo
{ public static string username;
}
主界面 f1 = new 主界面();


@◇蝴蝶ぢ 登录的代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace personnel_management{
public partial class 登录窗口 : Form
{
public class GlobalInfo
{ public static string username;
}
主界面 f1 = new 主界面();
SqlConnection mycon = new SqlConnection("server=lgd;uid=lgd;pwd=5555;database=personnel;");
SqlCommand cmd = new SqlCommand();
public 登录窗口()
{ InitializeComponent();
}
private void 登录窗口_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{ /* byte[] result = Encoding.Default.GetBytes(this.textpwd.Text.Trim()); //tbPass为输入密码的文本框
MD5 md5 = new MD5CryptoServiceProvider();
byte[] output = md5.ComputeHash(result);
string t = BitConverter.ToString(output).Replace("-", ""); */ if (radioButton1.Checked == false && radioButton2.Checked == false)
{ MessageBox.Show("请选择登录身份!");
}
if (radioButton1.Checked == true) //超级管理员
{
cmd.Connection = mycon;
cmd.CommandText ="select * from f_user where f_uname = '"+ textBox1.Text +"' and f_upwd = '"+ textBox2.Text +"'";
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count > 0)
{
MessageBox.Show("登录成功");
f1.Show();
this.Hide();
GlobalInfo.username = textBox1.Text;
}
else
{
MessageBox.Show("用户名不存在/密码错误");
}
}
if (radioButton2.Checked == true) //普通管理员
{
cmd.Connection = mycon;
cmd.CommandText = "select * from s_user where s_uname = '" + textBox1.Text + "' and s_upwd = '" + textBox2.Text + "'";
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count > 0)
{
MessageBox.Show("登录成功");
f1.Show();
this.Hide();
}
else
{
MessageBox.Show("用户名不存在/密码错误");
}
}
}
private void button3_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox1.Focus();
}
private void button2_Click(object sender, EventArgs e)
{ Application.Exit();
}
private void label2_Click(object sender, EventArgs e)
{
}
}
}


@ ◇蝴蝶ぢ

@◇蝴蝶ぢ 主界面的代码
namespace personnel_management
{
public partial class 主界面 : Form
{
public 主界面()
{
InitializeComponent();
}
private void 主界面_Load(object sender, EventArgs e)
{
textBox1.Text = GlobalInfo.username;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
}
}


public class GlobalInfo
{
public static string username;
}
把这个类写在命名空间下，不要把它写在登录窗口的类里