How to insert data in mysql database using C# - c#-4.0

Question

string query2 = "INSERT INTO library_database.status_of_issue VALUES('";
query2 = query2 +textBox2.Text + "','";
query2 = query2 + textBox1.Text + "', CURDATE(),ADDDATE(CURDATE(), INTERVAL 14 DAY)";
cmd = new MySqlCommand(query2, con);
MySqlDataReader d1 = cmd.ExecuteReader();
MessageBox.Show("Issed...");
d1.Close();

Answer 1

Missing the closing parenthesys for the VALUES clause, but your query should be rewritten to avoid Sql Injection and an INSERT query is executed with ExecuteNonQuery
string query2 = #"INSERT INTO library_database.status_of_issue VALUES(#p1, #p2,
CURDATE(),ADDDATE(CURDATE(), INTERVAL 14 DAY))";
cmd = new MySqlCommand(query2, con);
cmd.Parameters.AddWithValue("#p1", textBox2.Text);
cmd.Parameters.AddWithValue("#p2", textBox1.Text);
int rows = cmd.ExecuteNonQuery();
if(rows > 0)
MessageBox.Show("insert OK...");

Answer 2

So very obvious. You're missing the ending paranthesis of VALUES. This should work:
string query2 = string.Format("INSERT INTO library_database.status_of_issue VALUES('{0}', '{1}', CURDATE(), ADDDATE(CURDATE(), INTERVAL 14 DAY))", textBox2.Text, textBox1.Text);
using(var cmd = new MySqlCommand(query2, con))
{
if(cmd.ExecuteNonQuery() > 0)
MessageBox.Show("Issed...");
}
Also note that INSERT, UPDATE and DELETE commands should be executed using ExecuteNonQuery().