delete record fom sql server

Question

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hi to all!

here is my code in which i pass querry to delete record from sql server

on the form i have gridview and two text boxes when i click on particular record to delete that record first ol all display in text boxes and then i press delete button it delete the record

but the problem here is i want to check that record exists their or not if not display message record is not present in data base,

and if record is present the it will re confirm to delete the record

here is my function

{
try
            {
                count = 0;
                int count1 = 0;
                sql_string = ("Data Source=7070270275;Initial Catalog=dsffC;User Id=fssdfadf;Password=fdsfsdfsdf");
                SqlConnection conn = new SqlConnection(sql_string);
                conn.Open();
                SqlCommand command = conn.CreateCommand();
                command.CommandText = (str_querry);
                SqlDataReader rdr = command.ExecuteReader();
                if(rdr.Read())
                count1++;
                    
                if (count1 == 0)
                {
                    MessageBox.Show("There is No Such ID present in Data Base");
                    conn.Close();
                }
                else
                MessageBox.Show("Deleted");
                conn.Close();
                conn.Dispose();
                count++;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                MessageBox.Show("Error in database connection");
            }
        }

Posted 26-Jul-11 19:20pm

kami124

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Prerak Patel · Accepted Answer · 2011-07-26T19:24:00

Solution 1

ExecuteNonQuery[^] returns the number of rows affected. You can check it if it is 0.

int deletedRowsCount = command.ExecuteNonQuery();
if(deletedRowsCount==0) 
{
  MessageBox.Show("There is No Such ID present in Data Base");
}
else
{
  MessageBox.Show(deletedRowsCount.ToString() + "rows deleted.");
}

Posted 26-Jul-11 19:24pm

Prerak Patel

Comments

kami124 27-Jul-11 1:43am

ya you are absolutaly right but still there is one more problem
that before deleting from data base a message box show to re confirm it
if "yes" then delete and if no dont delete

Prerak Patel 27-Jul-11 1:59am

You can confirm with adding below code in if code in Tajuddin's answer.

var result = MessageBox.Show("Are you sure you want to delete?", "Confirm",
MessageBoxButtons.YesNo,
MessageBoxIcon.Question);
if (result == DialogResult.Yes)
{
//delete
}

Tajuddin_HYD · Accepted Answer · 2011-07-26T19:48:00

Hi,

the gridview was binded with available records only right then what is the use of searching again it is there are not ?

any how,

to test wheathere it is there are not and to delete follow the following one,

C#

SqlConnection con=new SqlConnection ("connectionstring");
        con.Open ();
        SqlCommand cmd = new SqlCommand("select count(*) from tableName where cid=1233", con);
        int i = 0;
        i=(int)cmd.ExecuteScalar();
        if (i > 0)
        {
            //record is available
            SqlCommand deleteCmd = new SqlCommand("delete tablename where cid=1233", con);
            int res = 0;
            res=deleteCmd.ExecuteNonQuery();
            if (res > 0)
            {
                //deleted successfully
            }
            else
            {
                //failed to delete
            }
        }
        else
        {
            //there is no record
        }