update gridview column values from another form in c# winform? -

i have 2 winforms mainform , gridform

in mainform.cs

executing cmd rmdir command 1 one using foreach

now want show list of directory name , status name wether process or not.

  foreach (var item in listbox1.items)   {      system.diagnostics.process.start("cmd.exe", "/c rmdir " + item);      // want show inside gridview in gridform folder done - uodate status done       var p = proc.exitcode;      string status;      if (p == 1){ status = "fail"}      else {status = "success"}      // how pass status text value gridform here?       tried       // grid view bind pass items , status ?      gridform statusform = new gridform(listbox1.items);      gridform.showdialog();  } 

problem i'm unable pass status value gridform

gridform.cs     private void gridform_load(object sender, eventargs e)    {         datatable dt = new datatable();         dt.columns.add("name");         foreach (string items in _itemlist)         {             datarow row = dt.newrow();             dt.rows.add(items);         }         this.statusgridview.datasource = dt;    } 

my question on mainform there foreach execute rmdir 1 one , when click on execute button on mainform execute above foreach code , open form gridform shows gridview 2 column foldername , status fooldername itemlist , current status foreach .

now how can bind gridview?

you can use bindingsource have datagrid respond changes in instances of viewmodel. can update property of specific viewmodel , bindingsource , databinding framework takes care of repainting , updating rows of grid.

first create viewmodel class implements inotifypropertychanged. brevity implemented status property raise property changed event.

class folderstatusviewmodel:inotifypropertychanged {     string _status;     string _folder;      private void changed(string propertyname)     {         var changed = propertychanged;         if (changed != null)         {             changed.invoke(this, new propertychangedeventargs(propertyname));         }     }      public string status     {         { return _status; }         set         {             _status = value;             changed("status");         }     }     public string folder { get; set; }      public event propertychangedeventhandler propertychanged; } 

make sure compile project before continuing next step.

on mainform drag , drop bindingsource toolbox data category. named mine folders. set datasource property new project datasource , select folderstatusviewmodel type.
set datasource of datagrid folders bindingsource.
in main form load event create collection (i prefer list) instance of folderstatusviewmodel each folder

private void mainform_load(object sender, eventargs e) {     var folders = new list<folderstatusviewmodel>();     foreach (var folder in directory.enumeratedirectories(@"c:\temp"))     {         folders.add(new folderstatusviewmodel {             folder = folder         });     }     this.folders.datasource = folders;  } 

on gridfrom add datagrid , bindingsource (i named 1 folders again). set bindingsource same project datasource folderstatusviewmodel , hookup datagrid binding source. overloaded constructor of gridform should take object assign bindingsource in load event:

public partial class gridform : form {     public gridform()     {         initializecomponent();     }      object source = null;      public gridform(object datasource):this()     {         this.source = datasource;     }      private void gridform_load(object sender, eventargs e)     {         this.folders.datasource = source;     } } 

when instantiate gridform can pass value of datasource property of bindingsource on mainform constructor of gridform:

// grid form takes datasource folders bindingsource var grid = new gridform(this.folders.datasource); grid.show();   // process each folder, making sure instance of  // instances of viewmodel, in case casting   // datasource object list foreach(var folderstatus in (list<folderstatusviewmodel>) this.folders.datasource) {     var pi = new processstartinfo();     pi.filename ="cmd.exe";     pi.arguments ="/c dir /s *.*";     pi.createnowindow = true;      var p =  new process();      p.enableraisingevents = true;     p.exited += (s,ee) => {          // here instance of folderstatusviewmodel         // gets status property updated         // subscribers propertychanged event         // notified. bindingsource instances subscribe these         // events, why magic happens.          if (p.exitcode > 0)         {             folderstatus.status = string.format("fail {0}", p.exitcode);         }          else         {             folderstatus.status = "succes";         }     };     p.startinfo = pi;     p.start(); } 

by leveraging bindingsource multiple froms databound of these instances updates simultaneously. databinding framewoek heavy lifting you.

if don't want use self created viewmodel existing datatable adapt above code follows:

the form_load event:

 private void mainform_load(object sender, eventargs e)  {      var folders = new datatable();       folders.columns.add("status");      folders.columns.add("folder");      foreach (var folder in directory.enumeratedirectories(@"c:\temp"))      {          var row = folders.newrow();          folders.rows.add(row);          row["folder"] = folder;      }      this.folders.datasource = folders;  } 

the processing:

// other code omitted foreach(datarow folderstatus in ((datatable) this.folders.datasource).rows) {      // other code omitted      p.exited += (s,ee) => {           if (p.exitcode > 0)          {              folderstatus["status"] = string.format("fail {0}", p.exitcode);          }           else          {              folderstatus["status"] = "succes";          }      };      // other code omitted } 

as datagrid has no way know columns exist have explicitly add each datagrid and set datapropertyname of each column: