C#.NET - Set textbox = dropdownlist selecteditem

txtApprovingSupervisor.Text = ddlApprovingSupervisor.SelectedValue.ToString();

That doesn't save it.

txtApprovingSupervisor.Text = ddlApprovingSupervisor.SelectedValue.ToString();

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Here's more of the code...

public void approvingSupervisor()
        {
            SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["***"].ConnectionString);
 
            myConnection.Open();
 
            string sqlApprovingSupervisor = "select displayName, email from *** order by displayName";
            SqlCommand cmdApprovingSupervisor = new SqlCommand(sqlApprovingSupervisor, myConnection);
            SqlDataReader sdrApprovingSupervisor = cmdApprovingSupervisor.ExecuteReader();
 
            ddlApprovingSupervisor.DataSource = sdrApprovingSupervisor;
            ddlApprovingSupervisor.DataValueField = "displayName";
            ddlApprovingSupervisor.DataTextField = "displayName";
            ddlApprovingSupervisor.DataBind();
 
            sdrApprovingSupervisor.Close();
 
            myConnection.Close();
        }

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are you getting any error?
Do you want as soon as dropdownlist selection changes?
if so then set AutoPostBack="true" for your DDL...
Or
share your dropdownList code and more info on your requirement.

oh you posted something....let me see that as well...

It doesn't have to post immediately, it can do it onClick.

the code you posted is for DDL databinding....
for inital selection you can explicitly do...

ddlApprovingSupervisor.DataTextField = "displayName";
            ddlApprovingSupervisor.DataBind();
---> ddlApprovingSupervisor.SelectedValue = whatever value you want to select intially Or
---> ddlApprovingSupervisor.SelectedIndex = 0 i.e. first item
            sdrApprovingSupervisor.Close();

Also when are you trying to populate the TextBox...after DDL DataBind or before that...
So provide the DDL markup and the place where you are trying to populate the TB
Or I am misunderstanding your requirement....

I'd say you understand it perfectly.

I've tried populating the textbox from immediately after calling approvingSupervisor() in the page_load, and putting it in a button click event that takes users to the next page.  It doesn't populate the textbox at either time.

can you share your DDL code and the button click where you are trying to set the TB value

protected void Page_Load(object sender, EventArgs e)
        {
            DateTime dtmDate;

            dtmDate = System.DateTime.Now;
            String dtmString;
            dtmString = dtmDate.ToString();
            lblRequestDate.Text = dtmString;
            lblRequestor.Text = GetUserName();

            approvingSupervisor();
        }

public void approvingSupervisor()
        {
            SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["***"].ConnectionString);

            myConnection.Open();

            string sqlApprovingSupervisor = "select displayName, email from *** order by displayName";
            SqlCommand cmdApprovingSupervisor = new SqlCommand(sqlApprovingSupervisor, myConnection);
            SqlDataReader sdrApprovingSupervisor = cmdApprovingSupervisor.ExecuteReader();

            ddlApprovingSupervisor.DataSource = sdrApprovingSupervisor;
            //ddlApprovingSupervisor.DataValueField = "displayName";
            ddlApprovingSupervisor.DataTextField = "displayName";
            ddlApprovingSupervisor.DataBind();

            sdrApprovingSupervisor.Close();

            myConnection.Close();
        }

        protected void btnSave_Click(Object sender, EventArgs e)
        {
            txtApprovingSupervisor.Text = ddlApprovingSupervisor.SelectedItem.Text;

            string strInsertReveal;
            SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["***"].ConnectionString);
            myConnection.Open();

INSERT statements below this point.

to me its looks it should work...
did you try setting breakpoint at this line:
---> txtApprovingSupervisor.Text = ddlApprovingSupervisor.SelectedItem.Text;
mouseover SelectedItem.Text and see the value for Text.

Nothing is there...
image.jpg

now thats insane....
the last thing I would like to see is your DDL markup from your .aspx page.

You bet...

<asp:DropDownList ID="ddlApprovingSupervisor" runat="server" Width="250px" />
 
<asp:TextBox ID="txtApprovingSupervisor" runat="server" />

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wonderful....that leaves me without a clue....
Let me see if something else strikes....

The first one is null.  I'll try that now.

THAT WORKED!!!!!  Thank you so much!!