一道初四数学的题,如图,正方形ABCD边长为9cm,动点P在CD边上移动,把正方形沿EF折叠,使点B与点P重合,点A与点
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void gridupdate(Object sender,DataGridCommandEventArgs e)

{

string stud_id,strsql,class_id;

int introw;

TextBox obj;

introw=e.Item.ItemIndex;

obj=(TextBox)dg.Items[introw].Cells[4].Controls[0];

class_id=obj.Text;

stud_id=dg.DataKeys[introw].ToString();

strsql="update studentinfo set class_id='" + class_id + "' where stud_id='" + stud_id + "'";

SqlConnection sqlcon=new SqlConnection("Data Source=localhost;uid=sa;pwd=246770397;Initial Catalog=student");

sqlcon.Open();

SqlCommand sqlcommand=new SqlCommand();

sqlcommand.Connection=sqlcon;

sqlcommand.CommandText=strsql;

sqlcommand.ExecuteNonQuery();

sqlcon.Close();

sqlcon=null;

sqlcommand=null;

dg.EditItemIndex=-1;

bindgrid();

}

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