有关C#问题请教

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace HcitPos.BaseInfo
{
    public partial class FrmClassInfoSet : Form
    {
        public FrmClassInfoSet()
        {
            InitializeComponent();
        }
        private void ClearControl()
        {
            txtClassID.Text = "";
            txtClassName.Text = "";
            txtClassUnit.Text = "";
            txtStoreBaseLine.Text = "0";
            txtStoreLimit.Text = "0";
        }
        private void InsertRecords()
        {
            string classid = txtClassID.Text;
            string classname = txtClassName.Text;
            string classunit = txtClassUnit.Text;
            int storelimit = int.Parse(txtStoreBaseLine.Text);
            int storebaseline = int.Parse(txtStoreLimit.Text);

SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=HcitPos;Integrated Security=True");
conn.Open();

string insert = "insert into goodsclass (classid, classname, classunit, storelimit, storebaseline) values ('" + classid + "', '" + classname + "', '" + classunit + "', '" + storelimit + "', '" + storebaseline + "')";
SqlCommand cmd = new SqlCommand(insert, conn);

cmd.ExecuteNonQuery();

            MessageBox.Show("操作完成！");
            ClearControl();

        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (action == SysUtility.OperationMethod.Insert)
                InsertRecords();
            if (action == SysUtility.OperationMethod.Edit)
                EditRecords();
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            Close();
        }
        private SysUtility.OperationMethod action = SysUtility.OperationMethod.Insert;
        public void SetActionMode(SysUtility.OperationMethod method)
        {
            this.action = method;
            if (method == SysUtility.OperationMethod.Insert)
                this.Text = "添加商品类别";
            else
                this.Text = "编辑商品类别";
        }
        public void InitControl(string classID, string className, string classUnit, string storeLimit, string storeBaseLine)
        {
            txtClassID.Text = classID;
            txtClassName.Text = className;
            txtClassUnit.Text = classUnit;
            txtStoreLimit.Text = storeLimit;
            txtStoreBaseLine.Text = storeBaseLine;
            txtClassName.Focus();
        }
        private void EditRecords()
        {
            SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=HcitPos;Integrated Security=True");
            conn.Open();

            string update = "update goodsclass set classname = '" + className + "',classunit = '" + classUnit + "', storelimit ='" + storeLimit + "',storebaseline = '" + storeBaseLine + "'where classid='" + classID + "'";
            SqlCommand cmd = new SqlCommand(update, conn);
            try
            {
                cmd.ExecuteNonQuery();
            }
            finally
            {
                    conn.Close();
            }
            MessageBox.Show("操作完成！");
            Close();
        }

}
}

运行后提示错误 1 当前上下文中不存在名称 “什么什么的”（字体加粗的那几个词）

怎么解决啊？

答案：这个问题很简单，你把这几个黑色粗体字重新定义一遍（明显缺少变量）。
例如（注意黑色部分）——
 
 private void EditRecords()
{
string className = xxx;
string classUnit= xxx;
//自己定义，注意类型匹配

SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=HcitPos;Integrated Security=True");
conn.Open();
string update = "update goodsclass set classname = '" + className + "',classunit = '" + classUnit + "', storelimit ='" + storeLimit + "',storebaseline = '" + storeBaseLine + "'where classid='" + classID + "'";
SqlCommand cmd = new SqlCommand(update, conn);
try
{
cmd.ExecuteNonQuery();
}
finally 
{
conn.Close();
}
MessageBox.Show("操作完成！");
Close();
}
哦，楼上也说了，我就补充清楚点吧，你把那些变量定义到了上面的InsertRecords()函数里面，下面的函数怎么访问得到呢？
你应该定义到全局，然后在InsertRecords()里面赋值就没问题了。前面的已经说的很详细了，EditRecords()方法中，你就没有定义这几个变量，想到 InitControl(string classID, string className, string classUnit, string storeLimit, string storeBaseLine)
方法中调用当然是不可以的啊

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