一个关于SqlDataReader的问题 前来请教
验证代码如下:
protected void cv_tbx_js_dh_ServerValidate(object source, ServerValidateEventArgs args)
{
SqlConnection sqlconn = myCon.getCon();
sqlconn.Open();
string sqlstr = "select * from jsxx where js_dh='" + this.tbx_js_dh.Text + "'";
SqlCommand sqlcom = new SqlCommand(sqlstr, sqlconn);
SqlDataReader read = sqlcom.ExecuteReader();
read.Read();
if (read.Read())
{
if (this.tbx_js_dh.Text.Trim() == read["js_dh"].ToString().Trim())
{
Response.Write("<script language=javascript>alter('对不起,该代号已经存在!');location='Addteacher.aspx'</script>");
return;
}
}
read.Close();
sqlconn.Close();
}
请问代码中if(read.Read())是什么意思?
哪位网友帮忙解决一下呀!
多谢!