How to Update and Delete data into SQL Server from C# code (i have made INSERT METHOD)

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C#

public bool Insert(User user)
        {
            SqlConnection con = new SqlConnection(new Connection().GetConnectionString());

            string sql = "INSERT INTO User (Email) values (@Email)";
            con.Open();
            SqlCommand cmd = new SqlCommand(sql, con);
            cmd.Parameters.Add("@Email", SqlDbType.VarChar);
            cmd.Parameters["@Email"].Value = User.email;
            //cmd.ExecuteNonQuery();

            bool isInserted = cmd.ExecuteNonQuery() > 0;
            return isInserted;

        }

Posted 2-Mar-15 23:58pm

Shahzeb.khan90

Updated 3-Mar-15 0:00am

RajeeshMenoth

v2

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Thanks7872 3-Mar-15 6:11am

By writing code.

2 solutions

Solution 1

Hi,

Ref : Simple Insert Select Update and Delete in ASP.Net Using MYSQL Database

Posted 3-Mar-15 0:04am

RajeeshMenoth

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Peter Leow · Accepted Answer · 2015-03-03T00:29:00

How to:
1. SQL Update[^]
2. SQL Delete[^]
However, modify them to use parameterized query so as to prevent sql injection[^]. For example:
Update Parameter:

string sql = "UPDATE users set email = @email where userid= @userid"
SqlCommand cmd = new SqlCommand(sql, con);
cmd.Parameters.AddWithValue("@userid",txtUserID);
cmd.Parameters.AddWithValue("@email",txtEmail);
cmd.ExecuteNonQuery();

Delete Parameter:

string sql = "DELETE FROM users where userid= @userid"
SqlCommand cmd = new SqlCommand(sql, con);
cmd.Parameters.AddWithValue("@userid",txtUserID);
cmd.ExecuteNonQuery();