窗口间传值（定义公共变量）

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;

namespace YXSetingSystem
{
    public partial class Form权限管理添加组 : Form
    {
        public bool IsOK = false;
        public string Title = "";

//定义公共变量pno和pname

        public string pno = "";
        public string pname = "";

       //public string PNO { get { return pname; } set { pname = value; } }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Title = this.textBox1.Text.Trim();

//给pname赋值等于this.textBox1.Text
            this.pname = this.textBox1.Text;
            this.IsOK = true;
            Form权限管理 f = new Form权限管理();

//在窗体Form权限管理中用pname值
            f.pname = this.pname;
            this.Close();
        }

    }
}

 将Form权限管理添加组窗体里面的值传给Form权限管理

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 YXToolSystem;
using DataSystem;

namespace YXSetingSystem
{
    public partial class FormF权限管理 : Form
    {
        public string pno = "";
        public string pname = "";

        public bool IsOK = false;
        public string PGLNO = "0";

        void save()
        {
            string sql = "delete from powergroup where pgtitleno='" + pno + "'";

            for (int i = 0; i < this.cDGV权限列表.Rows.Count; i++)
            {
                List<YXToolSystem.SQLStruct> col = new List<YXToolSystem.SQLStruct>();
                col.Add(new SQLStruct("PGTitleNO", pno));
                col.Add(new SQLStruct("PGTitleName", pname));
                col.Add(new SQLStruct("PGPBNO", this.cDGV权限列表.Rows[i].Cells["编号"].Value));
                col.Add(new SQLStruct("PGPBAdd", (this.cDGV权限列表.Rows[i].Cells["添加"].Value.ToString() == "√")));
                col.Add(new SQLStruct("PGPBAme", (this.cDGV权限列表.Rows[i].Cells["修改"].Value.ToString() == "√")));
                col.Add(new SQLStruct("PGPBDel", (this.cDGV权限列表.Rows[i].Cells["删除"].Value.ToString() == "√")));
                col.Add(new SQLStruct("PGPBSeeOne", (this.cDGV权限列表.Rows[i].Cells["查看个人"].Value.ToString() == "√")));
                col.Add(new SQLStruct("PGPBSeeDepartment", (this.cDGV权限列表.Rows[i].Cells["查看部门"].Value.ToString() == "√")));
                col.Add(new SQLStruct("PGPBSeeCompany", (this.cDGV权限列表.Rows[i].Cells["查看公司"].Value.ToString() == "√")));
                col.Add(new SQLStruct("PGPBSeeALL", (this.cDGV权限列表.Rows[i].Cells["查看全部"].Value.ToString() == "√")));
                sql += SQLGet.Add(col, "powergroup");
            }
            if (ClassData.UpDate(sql) > 0)
            {
                MessageBox.Show("设置成功！");
                this.Close();
            }
            else
            {
                MessageBox.Show("设置失败！");
            }
        }

    }

}