How to managed two sql queries in ASP.Net (Visual Studio 2010) - asp.net

Question

So what I'm trying to do is once I click a button. I want one sql query to insert values to the "Return_Process" Table and another sql query to delete data from the matching loan ID in another table, which is "Loan_Process".
This is the code I have written but its not deleting anything, its inserting the values to the return process but not deleting it from the loan process.
//Global variable declaration
string path;
string sql;
string sql2;
//create a method for database connection
public void connection()
{
//connection string
path = #"Data Source=NATHAN-PC\SQLEXPRESS;Initial Catalog=ASP;Integrated Security=True";
}
protected void Button1_Click(object sender, EventArgs e)
{
{
connection();
SqlConnection con = new SqlConnection(path);
con.Open();
//try
{
sql = "INSERT INTO Return_Process (Return_ID, FIne, Actual_Returned_Date, Loan_ID) VALUES ('" + txtRID.Text + "','" + txtfine.Text + "','" + TextBox1.Text + "','" + txtLID.Text + "')";
sql2 = "Delete FROM Loan_Process WHERE Loan_ID='"+txtLID+"'";
SqlCommand cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
//lblerrormsg.Visible = true;
//lblerrormsg.Text = "Success";
con.Close();
//GridView1.DataBind();
}
//catch (SqlException)
//{
// //lblerrormsg.Visible = true;
// //lblerrormsg.Text = "Invalid";
//}
con.Close();
//GridView1.DataBind();
}
}
}
}
I'm pretty bad at ASP.net, so if someone could tell me what to do to execute both queries at the same time, would greatly appreciate it.

Answer 1

Do something like this:
//your code
sql = "INSERT INTO Return_Process (Return_ID, FIne, Actual_Returned_Date, Loan_ID)"
+ " VALUES (#rid, #fine, #retDate, #lid); " //note ; inside
+ "Delete FROM Loan_Process WHERE Loan_ID=#lid;";
var cmd = new SqlCommand(sql, con);
cmd.Parameters.Add("#rid", SqlDbType.Int).Value = Int.Parse(txtRID.Text);
//similar for 3 remaining parameters. Just set correct SqlDbType
con.Open();
cmd.ExecuteNonQuery();
con.Close();