How can I make a message box pop up if no selection is made from a dropdown list but the submit button is clicked.

I need to make a message box pop up if a user doesnt select anything from my ddl but clicks the submit button. Id like my statement to stop wokring at this point too. Any help would be superb, thanks!
protected void btnSubmit_Click(object sender, EventArgs e)
    {
 
 
 
 
 
 
 
        string connectionString = "Server = *****;Database =****;User ID =*****;Password=********;Trusted_Connection = False; MultipleActiveResultSets=True" ;
 
        SqlConnection myConnection = new SqlConnection(connectionString);
        myConnection.Open();
 
 
        string EngineerID=null;
 
        string commandString1 = "SELECT EngineerID FROM tblNewCategory Where Category like '" + ddlCategory.SelectedValue + "'";
 
        SqlCommand myCommand1 = new SqlCommand(commandString1, myConnection);
 
        SqlDataReader myReader1 = myCommand1.ExecuteReader();
        myReader1.Read();
 
        if (myReader1.HasRows)
        {
            EngineerID = myReader1.GetInt16(0).ToString();
 
        }
 
        myReader1.Close();

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dwezilAsked:
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TimCotteeConnect With a Mentor Head of Software ServicesCommented:
Hello dwezil,

btSubmit.Attributes.Add("onclick","if(document.getElementById('ddlCategory').value=='NONE') {window.alert('You must select a category');return false;}");

Add this to your page load and click the button, you may need to have "NONE" as the value for your default selection / or change the above line to reflect your default selection.

Regards,

TimCottee
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BinuthCommented:

protected void btnSubmit_Click(object sender, EventArgs e)
    {
 
 
 if (comboBox1.SelectedIndex == -1)
			{
				MessageBox.Show("please select");
				return;
			}
 
 
 
 
        string connectionString = "Server = *****;Database =****;User ID =*****;Password=********;Trusted_Connection = False; MultipleActiveResultSets=True" ;
 
        SqlConnection myConnection = new SqlConnection(connectionString);
        myConnection.Open();
 
 
        string EngineerID=null;
 
        string commandString1 = "SELECT EngineerID FROM tblNewCategory Where Category like '" + ddlCategory.SelectedValue + "'";
 
        SqlCommand myCommand1 = new SqlCommand(commandString1, myConnection);
 
        SqlDataReader myReader1 = myCommand1.ExecuteReader();
        myReader1.Read();
 
        if (myReader1.HasRows)
        {
            EngineerID = myReader1.GetInt16(0).ToString();
 
        }
 
        myReader1.Close();

Open in new window

0
 
BinuthCommented:
sorry last comment is realted to windows app ... not for web
0
 
dwezilAuthor Commented:
Spot on mate cheers!
0
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