datatable removes duplicate lines

Remove duplicate rows in DataTable (all columns have the same data) :

 //DataView dv = dt3.DefaultView;     //dt3 The default virtual view 
 //dv.Sort = "wmid asc"; // The sorting 
 ///dv.ToTable(true, " The column name , The column name , The column name ");
 /// The first 1 The parameters, true   To get rid of repetition, false  Do not remove 
 /// The first 2 The fields to be displayed 
DataView dv = new DataView(dtname);    //dtname Refers to the need to remove duplicate lines datatable The name 
dtname = dv.ToTable(true);