How to run multiple SQL commands in a single SQL connection?
ado.net, c#, sql-server, sqlcommand, sqlconnection
Solution
Just change the `SqlCommand.CommandText` instead of creating a new `SqlCommand` every time. There is no need to close and reopen the connection.
// Create the first command and execute
var command = new SqlCommand("<SQL Command>", myConnection);
var reader = command.ExecuteReader();
// Change the SQL Command and execute
command.CommandText = "<New SQL Command>";
command.ExecuteNonQuery();
Problem
I am creating a project in which I need to run 2-3 SQL commands in a single SQL connection. Here is the code I have written: ``` SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\project.mdf;Integrated Security=True"); con.Open(); SqlCommand cmd = new SqlCommand("select * from " + mytags.Text + " ", con); SqlDataReader rd = cmd.ExecuteReader(); if (rd.Read()) { con.Close(); con.Open(); SqlCommand cmd1 = new SqlCommand("insert into " + mytags.Text + " values ('fname.lname@gmail.com','" + TextBox3.Text + "','" + TextBox4.Text + "','" + TextBox5.Text + "','"+mytags.Text+"')", con); cmd1.ExecuteNonQuery(); label.Visible = true; label.Text = "Date read and inserted"; } else { con.Close(); con.Open(); SqlCommand cmd2 = new SqlCommand("create table " + mytags.Text + " ( session VARCHAR(MAX) , Price int , Description VARCHAR(MAX), Date VARCHAR(20),tag VARCHAR(10))", con); cmd2.ExecuteNonQuery(); con.Close(); con.Open(); SqlCommand cmd3 = new SqlCommand("insert into " + mytags.Text + " values ('" + Session + "','" + TextBox3.Text + "','" + TextBox4.Text + "','" + TextBox5.Text + "','" + mytags.Text + "')", con); cmd3.ExecuteNonQuery(); label.Visible = true; label.Text = "tabel created"; con.Close(); } ``` I have tried to remove the error and I got that the connection is not going to else condition. Please review the code and suggest if there is any mistake or any other solution for this.