KeyDown Event

[lenniekuah]

Hi Friends,
Encounter another interesting problem of practical event. I have used FORM KEYDOWN event to navigate the cursor and on the Primary Key TextBox I tried to validate the input after ENTER was pressed it does not work.

Here are the coding

private void FrmCustomerRef_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Escape)
            {
                this.Close();
            }

            //navigate textbox
            if (e.KeyCode == Keys.Enter)
            {
                ProcessTabKey(true);
            }
        }

---------------------------------
Primay key TextBox

private void txtCustID_Enter(object sender, EventArgs e)
  {
   //check for duplicate CustomerID
          
  int intReturn = 0;   
  try
  {
  string strSql = "Select * from Customers Where CustomerID  = '" + this.txtCustID.Text + "'";
  sqlconn = new SqlConnection(connstr);
  sqlcmd = new SqlCommand(strSql, sqlconn);
 sqlconn.Open();

  intReturn = Convert.ToInt32(sqlcmd.ExecuteScalar());

  if (intReturn > 0)  // record duplicate
     {
  string txtMsg = "This CustomerID : " + txtCustID.Text + "\n"
                                          + " belongs to another Customer ";
     MessageBox.Show(txtMsg, "Duplicate CustomerID", MessageBoxButtons.OK);
           }
       }
   catch (Exception Ex)
     {
              MessageBox.Show(Ex.Message);
      } 
  }

[GaryTexmo]

Oh, I think it's because you've got a key down event for the form trying to control a text box. I believe these work for the control that's in focus, so if you're typing in a textbox and press enter, it won't fire the event in the form's key down event.

Try a key down event for the text box :)

Also, there is a series of events for "Validating " the textbox which happen automatically when the textbox would otherwise consider it's input complete (ie, enter or leave focus) which you can look into.

Hope that helps!

[ThatThatGuy]

Hi Friends,
Encounter another interesting problem of practical event. I have used FORM KEYDOWN event to navigate the cursor and on the Primary Key TextBox I tried to validate the input after ENTER was pressed it does not work.

Here are the coding

private void FrmCustomerRef_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Escape)
            {
                this.Close();
            }

            //navigate textbox
            if (e.KeyCode == Keys.Enter)
            {
                ProcessTabKey(true);
            }
        }

---------------------------------
Primay key TextBox

private void txtCustID_Enter(object sender, EventArgs e)
  {
   //check for duplicate CustomerID
          
  int intReturn = 0;   
  try
  {
  string strSql = "Select * from Customers Where CustomerID  = '" + this.txtCustID.Text + "'";
  sqlconn = new SqlConnection(connstr);
  sqlcmd = new SqlCommand(strSql, sqlconn);
 sqlconn.Open();

  intReturn = Convert.ToInt32(sqlcmd.ExecuteScalar());

  if (intReturn > 0)  // record duplicate
     {
  string txtMsg = "This CustomerID : " + txtCustID.Text + "\n"
                                          + " belongs to another Customer ";
     MessageBox.Show(txtMsg, "Duplicate CustomerID", MessageBoxButtons.OK);
           }
       }
   catch (Exception Ex)
     {
              MessageBox.Show(Ex.Message);
      } 
  }

TextBox.Enter doesn't stand for the event to fire when enter key was pressed...

it actually fires when the textbox has received focus...
you can check for a Enter key on TextBox.KeyPres s event and there execute your function