Stored Procedure ADO.NET error

Question

Hello I have a Stored Proc for the Registration Page, but I need ADO.NET to take values from various textboxes. However, I'm recieving error like this:

"System.ArgumentException: No mapping exists from object type System.Web.UI.WebControls.TextBox to a known managed provider native type. "

public void InsertInfo()
    {
        String empdb = @"Data Source=USER-PC\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=True";
        SqlConnection conn = new SqlConnection(empdb);
        SqlCommand cmd = new SqlCommand("bridge_Type", conn);
        cmd.CommandType = CommandType.StoredProcedure;


        try
        {
            conn.Open();
            cmd.Parameters.Add(new SqlParameter("@EmpID", TextBox1.Text));
            cmd.Parameters.Add(new SqlParameter("@Name", TextBox2.Text));
            cmd.Parameters.Add(new SqlParameter("@Mob2", TextBox3.Text));
            cmd.Parameters.Add(new SqlParameter("@Email", TextBox14.Text));
            cmd.Parameters.Add(new SqlParameter("@Emptype", dropdown1.SelectedValue));
            cmd.ExecuteNonQuery();
        }

        catch (System.Data.SqlClient.SqlException ex)
        {
            string msg = "Insert Error:";
            msg += ex.Message;
            throw new Exception(msg);

        }

        finally
        {
            if (conn != null)
            {
                conn.Close();
            }
        }

    }



    protected void Button1_Click(object sender, EventArgs e)
    {
        InsertInfo();
    }

Then I used this format to add values from controls:

cmd.Parameters.Add(new SqlParameter("@EmpID", SqlDbType.Int));
cmd.Parameters("@EmpID").Value = TextBox1.Text;

I'm getting errors on:

Its showing errors for these kind of codes by appearing red line under 'Parameters'.

Non-invocable member 'System.Data.SqlClient.SqlCommand.Parameters' cannot be used like a method.

Answer 1

Try TextBox1.Text, TextBox is the Control. The Text property holds the String value.

cmd.Parameters.Add(new SqlParameter("@EmpID", TextBox1.Text));

Answer 2

Try this code.

try
{
  string empdb = @"Data Source=USER-PC\SQLEXPRESS;Initial Catalog=EmployeeDB;Integrated Security=True";
  using (var conn = new SqlConnection(connString))
  {
    using (var cmd = new SqlCommand("bridge_Type",conn))
    {           
        cmd.CommandType = CommandType.StoredProcedure;           
        cmd.Parameters.AddWithValue("@EmpID",TextBox1.Text);
        cmd.Parameters.AddWithValue("@Name", TextBox2.Text);    
        cmd.Parameters.AddWithValue("@Mob2", TextBox3.Text); 
        cmd.Parameters.AddWithValue("@Email", TextBox14.Text); 
        cmd.Parameters.AddWithValue("@EmpType",dropdown1.SelectedValue); 
        conn.Open();
        cmd.ExecuteNonQuery();           
    }
  }
}
catch(Exception ex)
{
   string msg = "Insert Error:"+ ex.Message;
   throw new Exception(msg);
}

Make sure you are converting to the types same as the Parameter types in your stored proc ( Ex: If the parameter type of EmpID is int, you may need to convert the TextBox1.Text value to int. Check for null values also.

Answer 3

为什么不使用这种格式？

         cmd.Parameters.Add("@parameter", SqlDBType , size).value = TextBox1.Text