c# - DGV updates only when cell is clicked -

i have wfa, @ moment has 2 forms.

the first form contains datagridview, it's data source being list. when user clicks button, opens form2. within form2 have bubblesort algorithm sorts list 1 of it's properties. passes updates list form1, , sets new datasource bubbledsorted updated list form2.

now works, bubblesort works. however, dgv on form1 doesn't update unless click on individual rows/cells of dgv. have click on each 1 individually them in new sorted positions.

here's code have:

form1:

//this shows form2 private void sortbypriority_click(object sender, eventargs e)     {         fm2 = new form2();         fm2.show();     }     //this called form2 set new datasource     public  void refreshdatagrid(datagridview p)     {          datagridview1.datasource = null;         datagridview1.datasource = p.datasource;     } 

form2:

private void sortpriority_click(object sender, eventargs e)     {         int temp = 0;         bool tempforcomp;         string tempfordate = "";         string tempfordesc = "";         string tempforname = "";         (int write = 0; write < 10; write++)         {             (int sort = 0; sort < todogen.task.count - 1; sort++)             {                 if (todogen.task[sort].priority > todogen.task[sort + 1].priority)                 {                     temp = todogen.task[sort + 1].priority;                     tempforcomp = todogen.task[sort + 1].completed;                     tempfordate = todogen.task[sort + 1].dateofcompletion;                     tempfordesc = todogen.task[sort + 1].description;                     tempforname = todogen.task[sort + 1].name;                      todogen.task[sort + 1].priority = todogen.task[sort].priority;                     todogen.task[sort + 1].completed = todogen.task[sort].completed;                     todogen.task[sort + 1].dateofcompletion = todogen.task[sort].dateofcompletion;                     todogen.task[sort + 1].description = todogen.task[sort].description;                     todogen.task[sort + 1].name = todogen.task[sort].name;                      todogen.task[sort].priority = temp;                     todogen.task[sort].completed = tempforcomp;                     todogen.task[sort].dateofcompletion = tempfordate;                     todogen.task[sort].description = tempfordesc;                     todogen.task[sort].name = tempforname;                  }             }             datagrid n = new datagrid();             n.datasource = todogen.task;             refresh();         }     }     private void refresh()     {         fm1 = new form1();         fm1.refreshdatagrid(n);     } 

edit: updated , clear - need use multiple forms (university assignment), , nonetheless, didn't update when had sorting algorithm in form1.

i'll make simplified example doesn't use bubblesort algorithm, hope helps:

this code of form1 class. define stringvalue class because of this: how bind list<string> datagridview control?

public class stringvalue {     public stringvalue(string s)     {         _value = s;     }     public string value { { return _value; } set { _value = value; } }     string _value; }  public partial class form1 : form {     public form1()     {         initializecomponent();     }      private void form1_load(object sender, eventargs e)     {         datagridview1.datasource = new list<stringvalue> {             new stringvalue("string1"),             new stringvalue("string3"),             new stringvalue("string2")          };     }      private void button1_click(object sender, eventargs e)     {         form2 form2 = new form2(this, datagridview1.datasource list<stringvalue>);         form2.show();     }      public void refreshgrid(list<stringvalue> source)     {         datagridview1.datasource = source;     } } 

the button click event opens form2 , passes grid view datasource. here's form2:

public partial class form2 : form {     form1 _form1;     list<stringvalue> _source;      public form2(form1 form1, list<stringvalue> source)     {         _form1=form1;         _source=source;         initializecomponent();     }      private void button1_click(object sender, eventargs e)     {         _source = _source.orderby(x => x.value).tolist();         _form1.refreshgrid(_source);         this.close();     } } 

after click on button in form2 datagridview1's data source refreshed sorted version, , form2 closed.