c# - Error Panel Row Updating -


i want show error panel on row updating not show error panel. what's wrong code?

protected void grades_gridview_rowupdating(object sender, gridviewupdateeventargs e) {       string lettergrade = grades_gridview.datakeys[e.rowindex].values["letter_grade"].tostring();     textbox txtmingrade = (textbox)grades_gridview.rows[e.rowindex].findcontrol("txtmingrade");     textbox txtmaxgrade = (textbox)grades_gridview.rows[e.rowindex].findcontrol("txtmaxgrade");      if (convert.todecimal(txtmingrade.text) > convert.todecimal(txtmaxgrade.text))     {         panelerror.visible = true;         labelerrorstring.text = "minimum grade must not greater maximum grade!";          }     else     {         admin.updategraderanges(lettergrade, txtmingrade.text, txtmaxgrade.text);     }     grades_gridview.editindex = -1;     fillgraderangesingrid(); }


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