protected void btnAdd_Click(object sender, EventArgs e)
    {
        userid = (int)Session["UserId"];
        DataTable dt = blc.SearchbyIncomeCatName(txtCategory.Text, userid);

        if (dt.Rows.Count > 0)
        {
            ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('Category already exists.');", true);
            txtCategory.Text = string.Empty;
            txtCategory.Focus();
        }
        else
        {
            int i = blc.InsertIncomeCategory(txtCategory.Text, 1, userid);
            if (i > 0)
            {
                loadCategories();
                txtCategory.Text = string.Empty;
            }
        }
    }