Gridview Data Display on the Basis of 2 Combobox in 3 tier

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C#

Windows

Visual-Studio

forms

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I have placed 2 Combobox on a form and a Gridview.
Now the Data of Gridview i want to show on the basis of Combobox selection.
2nd combobox is dependent on first combobox.
i am trying this code but this is not working.
2 combobox name are
cbHadithBook
cbBaab

private void HadithBook() 
        {
            cbHadithBook.DataSource = objSearch.SelectHadithBookName();
            cbHadithBook.DisplayMember = "Book_English_Name";
            cbHadithBook.ValueMember = "Book_Id";
        }

        private void HadithBaab()
        {
                objSearch.HadithBookNo = Convert.ToInt32(cbHadithBook.SelectedValue.ToString());
                cbBaab.DataSource = objSearch.SelectHadithBaabEnglish();
                if (cbLanguage.SelectedIndex == 0 || cbLanguage.SelectedIndex == 1)
                {
                    cbBaab.DisplayMember = "Baab_Urdu_Name";
                }
                else if (cbLanguage.SelectedIndex == 2)
                {
                    cbBaab.DisplayMember = "Baab_English_Name";

                }
                cbBaab.ValueMember = "Baab_Id";

                objSearch.Baab_Id = Convert.ToInt32(cbBaab.SelectedValue.ToString());
                dgvhadiths.DataSource = 
                 objSearch.SelectHadithText(objSearch.HadithBookNo, objSearch.Baab_Id);
         

        }

        private void Form1_Load(object sender, EventArgs e)
        {

            cbLanguage.SelectedIndex = 2;
            cbHadithBook.SelectedValue = 1;
            cbBaab.SelectedValue = 1;
            HadithBook();
            HadithBaab();
}

//here combox events

private void cbHadithBook_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            HadithBaab();

        }
  private void cbBaab_SelectedIndexChanged(object sender, EventArgs e)
        {
            HadithBook();
}