Question

here i am using sqlite data base .and code for this are here:

using (SQLiteCommand cmd = new SQLiteCommand(query, conn))
{
    conn.Open();
    cmd.ExecuteNonQuery();

    cmd.CommandText = 
         "insert into users(name, password, priviledges) values(" +
          "'" + UsernameText.Text.Trim() + "', " + "'" + 
         QuickMethods.MD5(PasswordText.Password.Trim()) + "', " + "524287" + ")";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO company VALUES('name','" + CompanyName.Text.Trim() + "');";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO company VALUES('address','" + CompanyAddress.Text.Trim() + "');";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO company VALUES('phone','" + CompanyPhone.Text.Trim() + "');";
    cmd.ExecuteNonQuery();

    cmd.CommandText = "INSERT INTO company VALUES('email','" + CompanyEmail.Text.Trim() + "');";
    cmd.ExecuteNonQuery();

    conn.Close();
}

I got exception at line cmd.ExecuteNonQuery() how to solve it.

Answer 1

Your first cmd.ExecuteNonQuery(); is the culprit. The one below connection opening.

I think it gives error there because command is not set till that time. Comment it and it should fine.

EDIT

If that did not work
there can be 2 reasons for this problem.

First – connection is made to the right database but there is no such table there.

Second – connection is made to the wrong database. In such case it gives no error. It makes a database file at the specified location. Even Opens the database. But gives this error when fetching/updating data. In such case the specified location will contain a database of 0 KB.

My Answer to this question will help you

Note/Warning related to question, not related to answer:

Always be aware of SQL Injection. Use Parameterised Query (the one with @).

More on SQL Injection