What is problem with tis connection

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C#

SqlConnection con = new SqlConnection();
            con.ConnectionString = "Server=(Local); Database=final; Integrated Security=True";
            con.Open();
            SqlCommand cmd = new SqlCommand("SELECT * FROM [zarfiat] WHERE shahr=@shahr AND mantaghe=@mantaghe",con);
            cmd.Parameters.AddWithValue("shahr",textBox5.Text);
            cmd.Parameters.AddWithValue("mantaghe", textBox6.Text);
            SqlDataReader dr = null;
            dr = cmd.ExecuteReader();
            while(dr.Read())
            {
                zarfiat=Convert.ToInt32(dr["zarfiat"]);
                if (zarfiat > 0)
                {
                    if (textBox1.Text != "" & textBox2.Text != "" & textBox3.Text != "" & textBox4.Text != "" & textBox5.Text != "" & textBox6.Text != "")
                    {
                        cmd = new SqlCommand("INSERT INTO [info] (kod,name,family,tel,shahr,mantaghe) VALUES ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "')");
                        cmd.ExecuteNonQuery();
                    }
                    else label8.Text = "پر کردن تمامی اطلاعات الزامی می باشد";
                }
                else label8.Text = "ظرفیت خالی در  مکان مورد نظر موجود نمی باشد";
            }
            zarfiat--;
            cmd = new SqlCommand("UPDATE [final] SET zarfiat='"+zarfiat+"'");
            cmd.ExecuteNonQuery();
            label8.Text = "مشترک مورد نظر با موفقیت ثبت شد";
            con.Close()

This error appear...

C#

An unhandled exception of type 'System.InvalidOperationException' occurred in System.Data.dll
Additional information: ExecuteNonQuery: Connection property has not been initialized.

Posted 11-Feb-14 20:17pm

m-e-h-d-h-i

Updated 11-Feb-14 20:18pm

v2

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Paw Jershauge · Answer 1 · 2014-02-11T20:39:00

You have NO Connection on cmd the second time around:

cmd = new SqlCommand("INSERT INTO [info] (kod,name,family,tel,shahr,mantaghe) VALUES ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "')");

Should be:

cmd = new SqlCommand("INSERT INTO [info] (kod,name,family,tel,shahr,mantaghe) VALUES ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "')",con);

notice that con was added...

But anyhow, this will NOT Work, as you change the cmd, the while loop will throw an exception, I think.

SqlCommand cmdInsert = new SqlCommand("INSERT INTO [info] (kod,name,family,tel,shahr,mantaghe) VALUES ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "','" + textBox6.Text + "')",con);
cmdInsert.ExecuteNonQuery();

And Again, this is not recommended, use SqlParameter to pass the informations from all the textboxes.