Runtime Error: Object reference not set to an instance of an object. --> please help me
int bookID = int.Parse(txtboxSearchbyISBN.Text);
dsBookISBN = SearchData.ListBookByISDN(bookID);
DataSet dsBookISBN = new DataSet();
Services SearchData = new Services();
DataRow dr;
int bookID = int.Parse(txtboxSearchbyISBN.Text);
dsBookISBN = SearchData.ListBookByISDN(bookID);
try{
dr = dsBookISBN.Tables["Table"].Rows[0]; //<----- i have errors on this line
lbltitle.Text= "Book Title :" + dr["bookTitle"].ToString();
lblauthor.Text = "Author :" + dr["bookAuthor"].ToString();
lblisbn.Text= "ISBN :" + dr["bookISBN"].ToString();
lblpubliser.Text= "Publiser :" + dr["bookPublisher"].ToString();
lblyearpublished.Text= "Year Published :" + dr["bookYearPublished"].ToString();
lbldatereceived.Text= "Date Received :" + dr["bookDateReceived"].ToString();
lblcategory.Text= "Category :" + dr["bookCategory"].ToString();
lblloanstatus.Text= "Loan Status :" + dr["bookLoanStatus"].ToString();
ActiveForm = frmSearchResult;
}
catch(System.IndexOutOfRangeException)
{
lblError.Visible = true;
}