c# - Extracting files using SevenZip -

im getting exception in can 1 me?

exception:unable cast com object of type 'system.__comobject' interface type 'sevenzip.iinarchive'. operation failed because queryinterface call on com component interface iid '{23170f69-40c1-278a-0000-000600600000}' failed due following error: no such interface supported (exception hresult: 0x80004002 (e_nointerface)) 

code:

private void unzip(string ziptoextract, string unzipdirectoryl) // extract zip/lot file in same directory     {              #region extraction test - extractfiles             using (var tmp = new sevenzipextractor(ziptoextract))             {                 if (this.progressbar1.invokerequired)                 {                     progressbar1.invoke(new action(delegate()                     {                         progressbar1.maximum = tmp.archivefiledata.count;                         progressbar1.value = 0;                     }));                 }                 else                 {                     progressbar1.maximum = tmp.archivefiledata.count;                     progressbar1.value = 0;                  }                 (int = 0; < tmp.archivefiledata.count; i++)                 {                     tmp.extractfiles(unzipdirectoryl, tmp.archivefiledata[i].index);                      int tempval = 0,tot=0;                     if (this.progressbar1.invokerequired)                     {                         progressbar1.invoke(new action(delegate() { progressbar1.value++; tempval = progressbar1.value; progressbar1.refresh(); tot = progressbar1.maximum; }));                     }                     else                     {                         progressbar1.value++; //pseudo-code                         progressbar1.refresh();                         tempval = progressbar1.value;                         tot = progressbar1.maximum;                     }                     //progressbar1.value += 1;                     //progressbar1.refresh();                      if (this.label3.invokerequired)                     {                         label3.invoke(new action(delegate() { label3.text = ((tempval * 100) / (tot)).tostring(); label3.refresh(); }));                     }                     else                     {                         label3.text = ((tempval * 100) / (tmp.archivefiledata.count)).tostring();                         label3.refresh();                     }                     if (!tmp.archivefiledata[i].isdirectory)                     {                         fileinfo f = new fileinfo(unzipdirectoryl + "\\" + tmp.archivefiledata[i].filename);                         if (f.length == 0)                         {                             status("error :zero byte file observed: \\" + tmp.archivefiledata[i].filename, color.red);                         }                     }                 }                 // extract more 1 file @ time or when know files extract,                 // use                 //tmp.extractfiles(@"d:\temp\result", 1, 3, 5);             }              #endregion      }  

i got own solution : change gives me perfect out put why?

int temp= tmp.archivefiledata.count; if (this.progressbar1.invokerequired)             {                 progressbar1.invoke(new action(delegate()                 {                     progressbar1.maximum = temp;                     progressbar1.value = 0;                 }));             } 

it me out of exception:

int temp= tmp.archivefiledata.count; if (this.progressbar1.invokerequired)         {             progressbar1.invoke(new action(delegate()             {                 progressbar1.maximum = temp;                 progressbar1.value = 0;             }));         }