c# - Update single cells in DataGrid -

how can update single cell in datagrid row id?

my output works @ moment 1 static row. (messagebox output shows right values) intention use on whole grid.

private void btnupdateuserdata_click(object sender, routedeventargs e) {    messagebox.show("id: " + muserdataobject[0].id + ", username: " +                      muserdataobject[0].username + ", password: " +                      muserdataobject[0].password + ", rolle: " +                      muserdataobject[0].role);         // implemented         // muserdataobject[i].username = "new username"; } 

xaml code

<datagridtemplatecolumn>     <datagridtemplatecolumn.celltemplate>         <datatemplate>             <button click="btnupdateuserdata_click">update</button>         </datatemplate>     </datagridtemplatecolumn.celltemplate> </datagridtemplatecolumn> 

if want update value row on button clicked, button's datacontext represent instance of user object.

modify property directly instance , reflected in ui instantly provided inotifypropertychanged implemented on user class.

private void btnupdateuserdata_click(object sender, routedeventargs e) {    datagrid.commitedit(); // add line editing cell gets commit.    user currentuser = ((button)sender).datacontext user;        messagebox.show("id: " + currentuser.id + ", username: " +                      currentuser.username + ", password: " +                      currentuser.password + ", role: " +                      currentuser.role);        currentuser.username = "new username"; } 

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update

in case want update property selecteditem, give x:name datagrid , use access selected item of datagrid.

xaml

<datagrid x:name="datagrid">    .... </datagrid> 

code behind

private void btnupdateuserdata_click(object sender, routedeventargs e) {    datagrid.commitedit(); // add line editing cell gets commit.    user currentuser = datagrid.selecteditem user;    // currentuser null in case selecteditem null.    if(currentuser != null)    {       messagebox.show("id: " + currentuser.id + ", username: " +                         currentuser.username + ", password: " +                         currentuser.password + ", rolle: " +                         currentuser.role);        currentuser.username = "new username";    } }