Searching data in my database [duplicate]

Question

This question already has answers here:

Like Operator in Entity Framework? (9 answers)

Closed 3 years ago.

My work here is working but if search 1 it display 40 instead of 900 here is my work:

command.CommandType = CommandType.Text;
command.CommandText = ("SELECT * FROM Computation WHERE Transaction_ID LIKE '" + textBox1.Text.ToString() + "%'");

command.Connection = connection;    
connection.Open();  
var reader = command.ExecuteReader();              
while (reader.Read())
{                  
   textBox2.Text = (String.Format("{0000,0:N2}", Int32.Parse(reader["Total_Bill"].ToString())));
}                  
connection.Close();

Answer 1

As I wrote in my comment, I don't understand why you used LIKE here but you can ExecuteScalar which is perfect in your situation.

Executes the query, and returns the first column of the first row in the result set returned by the query.

Like;

command.CommandType = CommandType.Text;
command.CommandText = ("SELECT Total_Bill FROM Computation WHERE Transaction_ID = @ID");
command.Parameters.AddWithValue("@ID", textBox1.Text);    
command.Connection = connection;
try
{    
  connection.Open();  
  textBox2.Text = (String.Format("{0000,0:N2}", command.ExecuteScalar()));            
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}                 
connection.Close();