c# - Drop down list - input string was not in correct format -

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i have below metod:

private void bindmodels(int makeid, int typeid) {     try     {         dataset ds = (dataset)viewstate["ds_ddlsdata"];         enumerablerowcollection models;         if (typeid != null)         {             models = dt_models in ds.tables[10].asenumerable()                          dt_models.field<int>("makeid") == makeid & dt_models.field<int>("typeid") == typeid                          select new                          {                              modelname = dt_models.field<string>("modelname"),                              modelid = dt_models.field<int>("modelid")                          };         }         else         {             models = dt_models in ds.tables[10].asenumerable()                      dt_models.field<int>("makeid") == makeid                      select new                      {                          modelname = dt_models.field<string>("modelname"),                          modelid = dt_models.field<int>("modelid")                      };         }          ddlmodel.datasource = models;         ddlmodel.datatextfield = "modelname";         ddlmodel.datavaluefield = "modelid";         ddlmodel.databind();         ddlmodel.items.insert(0, new listitem("-- select model --", "-1"));         ddlmodel.selectedindex = 0;     }     catch (exception ex)     {         var error = new javascriptserializer().serialize(ex.message.tostring());         scriptmanager.registerstartupscript(this, this.gettype(), "myalert", "alert('" + error + "');", true);         methods.logerrors(session["user"].tostring(), this.page.tostring(), methodbase.getcurrentmethod().name.tostring(), ex.tostring());     } }

which call from:

    protected void ddlmake_selectedindexchanged(object sender, eventargs e) {     try     {         if (pnlmodels.visible == false)         {             pnlmodels.visible = true;         }          bindmodels(convert.toint32(ddlmake.selectedvalue), convert.toint32(ddltype.selectedvalue));     }     catch (exception ex)     {         var error = new javascriptserializer().serialize(ex.message.tostring());         scriptmanager.registerstartupscript(this, this.gettype(), "myalert", "alert('" + error + "');", true);         methods.logerrors(session["user"].tostring(), this.page.tostring(), methodbase.getcurrentmethod().name.tostring(), ex.tostring());     } }

the problem in cases type drop down list can empty. question how bindmodels method should like, because receiving error - input string not in correct format. in advance reply.


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