عدم ذخیره اطلاعات در بانک بدون رخ دادن خطا

[toorkaman]

سلام روزتون بخیر

کد زیر رو وقتی اجرا میکنم چیزی رو از پایگاه داده نمایش نمی دهد و اروری هم نمی گیرد
مرا راهنمایی کنید
با تشکر فراوان

private void jostejo_Click(object sender, EventArgs e)

{

    objconn.Open();

    switch (comboBox2.SelectedIndex)

    {

        case 0:

            SQLSTR = "select univer as 'دانشکده',reshte as 'رشته',maghtah as 'مقطع',nimsal as 'نیمسال' ,nezam as 'نظام' , men as 'مرد' from ict where univer =\'" + textBox1.Text + "\'";

            break;



        case 1:

            SQLSTR = "select univer as 'دانشکده',reshte as 'رشته',maghtah as 'مقطع',nimsal as 'نیمسال' ,nezam as 'نظام' , men as 'مرد' from ict where reshte =\'" + textBox1.Text + "\'";

            break;



        case 2:

            SQLSTR = "select univer as 'دانشکده',reshte as 'رشته',maghtah as 'مقطع',nimsal as 'نیمسال' ,nezam as 'نظام' , men as 'مرد' from ict where maghta =\'" + textBox1.Text + "\'";

            break;



        case 3:

            SQLSTR = "select univer as 'دانشکده',reshte as 'رشته',maghtah as 'مقطع',nimsal as 'نیمسال' ,nezam as 'نظام' , men as 'مرد' from ict where nezam =\'" + textBox1.Text + "\'";

            break;

    }



    SqlDataAdapter objadapter = new SqlDataAdapter(SQLSTR, objconn);

    DataSet DS = new DataSet();

    objadapter.Fill(DS, "ict");

    datagv1.DataBindings.Add(new Binding("DataSource", DS, "ict"));

    datagv1.DataBindings.Clear();

    objconn.Close();

}

[robat7]

سلام
ببخشید چرا از علامت "\" قبل از single quotation استفاده کرده اید؟