从北师大珠海分校去珠海如家快捷酒店(拱北步行街)要坐哪一路的公车,在哪个站下车?去拱北口岸又得怎么去?

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写一个验证函数private bool Is_Exist(){string Constring = "Provider=SQLOLEDB;Data Source=.;Integrated Security=SSPI;Initial Catalog=shopingdb"; OleDbConnection conn = new OleDbConnection(Constring); string sql = "select * from users where userName='"; sql += txb_name.Text.Trim() + "'"; OleDbCommand cmd = new OleDbCommand(sql, conn); OleDbDataReader dr; conn.Open(); dr = cmd.ExecuteReader(); if (dr.Read()) { txb_name.Text = "";return true; } else return false;}再在button中写代码protected void LinkButton8_Click(object sender, EventArgs e) {if(!Is_Exist()){//不存在该用户，可注册}else//存在返回{}}