dridview not displaying any data

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SqlConnection objCon = new SqlConnection(@"Data Source=MIS-PC;Initial Catalog=projecthotel;Integrated Security=True");

SqlCommand objCmd = new SqlCommand();
objCmd.Connection = objCon;

string query = "insert into Reservation values('" + textBox1.Text + "', '" + comboBox2.Text + "','" + textBox4.Text + "','" + textBox6.Text + "','" + textBox7.Text + "','" + textBox15.Text + "','" + comboBox7.Text + "','" + comboBox8.Text + "','" + comboBox9.Text + "','" + textBox25.Text + "','" + textBox17.Text + "','" + textBox18.Text + "','" + textBox20.Text + "','" + textBox21.Text + "')";

objCmd.CommandText = query;

objCon.Open();
int j = objCmd.ExecuteNonQuery();
if (j > 0)
{

MessageBox.Show("Record Inserted","www.codingresolved.com");
dataGridView3.Rows.Clear();
}

objCon.Close();

Form1 form1 = new Form1();
form1.Show();
}

Posted 24-Apr-14 1:59am

hilbert hussen

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OriginalGriff · Answer 1 · 2014-04-24T02:16:00

Solution 1

For starters, don't do it like that! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

Secondly, an INSERT operation affect the DB but it doesn't affect your application display.

Thirdly, you are emptying the DataGridView when you have successfully inserted the record, so it will always be empty.

There is nothing in your code that displays records, unless your new form access the DB and retrieves them.

Posted 24-Apr-14 2:16am

OriginalGriff

Comments

hilbert hussen 24-Apr-14 8:27am

how to do that sir

OriginalGriff 24-Apr-14 8:39am

How do do what, exactly?
Remember that we can't see your screen, access your HDD, or read your mind - I only get exactly what you tell me.

hilbert hussen 24-Apr-14 8:41am

That values are going into database but not displying gridview

OriginalGriff 24-Apr-14 10:39am

I can't see your screen, remember? :laugh:
What GridView? The one you clear? A different one?
How are you loading it? Where is it? Which form? When are you loading it?
Have you switched to parameterised queries?