WinForm　的正则表达式.在线等~请各位帮忙
OpenFileDialog   openFileDialog1   =   new   OpenFileDialog();
openFileDialog1.InitialDirectory   =   "c:\\ ";
openFileDialog1.Filter   =   "txt   files   (*.xls)|*.xls ";
openFileDialog1.FilterIndex   =   2;
openFileDialog1.RestoreDirectory   =   true;
if   (openFileDialog1.ShowDialog()   ==   DialogResult.OK)
{
        this.textBox1.Text   =   openFileDialog1.FileName;
}
string   mystring   =   "Provider   =   Microsoft.Jet.OLEDB.4.0   ;   Data   Source   =   ' "   +   strPath   +   " ';Extended   Properties=Excel   8.0 ";
OleDbConnection   cnnxls   =   new   OleDbConnection(textBox1.Text);
问题,提示路径不对,C:\f\f.xls
正确应该是C:\\f\\f.xls

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不用反斜杠，全部用斜杠//试试看
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@ "C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\Projects\KnowlgBaseSystem ";

这样写 绝对没问题 直接复制路径过来 前面加@
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是 "\\ "不是 "// ",或者在前面加@
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看不太明白，不过觉得应该这样：


string mystring = "Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = ' " + textBox1.Text + " ';Extended Properties=Excel 8.0 ";
OleDbConnection cnnxls = new OleDbConnection(mystring );

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这跟正则表达式有什么关系？

哪一行提示的错误，是这一行吗？
string mystring = "Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = ' " + strPath + " ';Extended Properties=Excel 8.0 ";

Data Source = 后加“ '”做什么的？这样试下

string mystring = "Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source= " + strPath + ";Extended Properties=Excel 8.0 ";

PS：strPath是什么，你的代码并没有给出