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string sql = " SELECT COUNT(Mobile) mcount FROM dbo.Yuanboguoji_student WHERE Mobile=‘" + txtMobile.Text.Trim() + "‘"; DataSet ds = DbHelperSQL.Query(sql); int mcount = Convert.ToInt32(ds.Tables[0].Rows[0][0]); if (mcount > 0) { this.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert(\"" + "号码已经存在;" + "\");location.reload();</script>"); return; }
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原文地址:http://www.cnblogs.com/panqingqiang/p/4635593.html