upload pdf or image via .net/Angular/c# & mssql

---------------------------ANGULAR HTML code-------------------------------------------

div class="row mb-6" [hidden]="selectedFile!=null" (click)="openDialog()"
div class="col-xs-2 ml-4"
input id="image" (change)="onSelectedFile($event)" accept="image/jpeg,.pdf" type='file' hidden /
button id='uploadButton' class="btn btn-light-primary font-weight-bold btn-round btn-border"i class="fas fa-paperclip"/i/button
/div
div class="col-md-3 mt-3"
pspan class="clickable"Attach Files/spanlight(Kindly Upload files less than or equal to 20 MB.)/light/p
/div
/div

div class="row mb-6" [hidden]="selectedFile==null"
div class="col-xs-2 ml-4"
button class="btn btn-light-primary font-weight-bold btn-border"i class="far fa-file-image"/i/button
/div
div class="col mt-3"
pspan class="clickable"{{selectedFile?.name}}/spanlight (click)="clearFile()" i class="fa fa-times fa-sm ml-2"/i/light/p
/div

/div


---------------------------------------------------------ANGULAR components code -----------------------------------------------------------------
onSelectedFile(event) {




if (x 20480) {

return false;

}
else
{
}

}
else
{
return false;
}
var reader1 = new FileReader();

};
}
}

---------------------------------------------------------------------------------
public uploadedFileData: string;
------------------------------------------