How to delete data on datagrid using SQL query in WPF

Question

1.00/5 (2 votes)

See more:

when i click delete button then shows error enable to cast an data object
so please solve this error

What I have tried:

C#

private void DeleteData_OnClick(object sender, RoutedEventArgs routedEventArgs)
{
    var selectedRow = MyDataGrid.SelectedItem;
    BookingRequest request = selectedRow as BookingRequest;
    long id = request.ID;
    con.Open();
    string query = "Delete from BookingRequest where ID ='"+ id +"'";
    SqlCommand sqlcmd = new SqlCommand(query, con);
    sqlcmd.ExecuteNonQuery();
    MessageBox.Show("Data deleted successfully");
    con.Close();
    Load();
}

Posted 29-Mar-19 22:43pm

NaeemSardar.ifish

Updated 4-Apr-19 8:15am

Richard Deeming

v2

Add a Solution

Comments

Suvendu Shekhar Giri 30-Mar-19 4:46am

Please share the piece of relevant code so that we can help.

Richard MacCutchan 30-Mar-19 5:32am

We cannot solve it since you have not provided any useful information. Please provide the code that causes the error and the exact error message.

NaeemSardar.ifish 30-Mar-19 8:19am

best of luck happy coding

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Patrice T · Answer 1 · 2019-03-30T11:37:00

C#

query = "Delete from BookingRequest where ID ='"+ id +"'";

Not necessary a solution to your question, but another problem you have.
Never build an SQL query by concatenating strings. Sooner or later, you will do it with user inputs, and this opens door to a vulnerability named "SQL injection", it is dangerous for your database and error prone.
A single quote in a name and your program crash. If a user input a name like "Brian O'Conner" can crash your app, it is an SQL injection vulnerability, and the crash is the least of the problems, a malicious user input and it is promoted to SQL commands with all credentials.
SQL injection - Wikipedia[^]
SQL Injection[^]
SQL Injection Attacks by Example[^]
PHP: SQL Injection - Manual[^]
SQL Injection Prevention Cheat Sheet - OWASP[^]
How can I explain SQL injection without technical jargon? - Information Security Stack Exchange[^]

NaeemSardar.ifish · Answer 2 · 2019-03-30T02:19:00

private void DeleteData_OnClick(object sender, RoutedEventArgs routedEventArgs)
          {
              var selectedRow = MyDataGrid.SelectedItem;
              BookingRequest request = selectedRow as BookingRequest;
              long id = request.ID;
              con.Open();
              string query = "Delete from BookingRequest where ID ='"+ id +"'";
              SqlCommand sqlcmd = new SqlCommand(query, con);
              sqlcmd.ExecuteNonQuery();
              MessageBox.Show("Data deleted successfully");
              con.Close();
              Load();
                 }

How to delete data on datagrid using SQL query in WPF

2 solutions

Solution 2

Solution 1

Add your solution here

Preview 0