c# - Masking password column in datagridview -

i'm having problem masking password column. code below works, doesnt work way want. while editing mask password when done , continue next datagridviewcell password becomes visible.

private void datagridview1_editingcontrolshowing(object sender, datagridvieweditingcontrolshowingeventargs e) {                     if (  datagridview1.currentcell.columnindex == 5 || datagridview1.currentcell.columnindex == 10)//select target column         {             textbox textbox = e.control textbox;             if (textbox != null)             {                 textbox.usesystempasswordchar = true;             }                         }         var txtbox = e.control textbox;         txtbox.keydown -= new keyeventhandler(underlyingtextbox_keydown);         txtbox.keydown += new keyeventhandler(underlyingtextbox_keydown); } 

also in edit mode should have mask columns index 5 && 10 masks columns. cannot solve these issues, great.

    private void datagridview1_cellformatting(object sender, datagridviewcellformattingeventargs e)     {         if ((e.columnindex == 5 || e.columnindex == 10) && e.value != null)             {                 datagridview1.rows[e.rowindex].tag = e.value;                 e.value = new string('\u25cf', e.value.tostring().length);             }     }      private void datagridview1_editingcontrolshowing(object sender, datagridvieweditingcontrolshowingeventargs e)     {         if (datagridview1.currentcell.columnindex == 5 || datagridview1.currentcell.columnindex == 10)//select target column         {             textbox textbox = e.control textbox;             if (textbox != null)             {                 textbox.usesystempasswordchar = true;             }         }         else         {             textbox textbox = e.control textbox;             if (textbox != null)             {                 textbox.usesystempasswordchar = false;             }         }         var txtbox = e.control textbox;         txtbox.keydown -= new keyeventhandler(underlyingtextbox_keydown);         txtbox.keydown += new keyeventhandler(underlyingtextbox_keydown);     }