How do I get my drop-list selection to send iformation from database into text box

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I have written the code to get my drop-down list selection to print a piece of information into my text box from the database. There are no errors highlighted by visual studio in the code, and it appears correct to me but nothing goes into the text box once a selection is made in the drop-down list.

C#

protected void perBanDDL_SelectedIndexChanged(object sender, EventArgs e)
        {
            //Creating a Select statement that searches for record that matches PersonalID from Value property.
            string perBanSelectSql;
            perBanSelectSql = "SELECT PersonalEmail FROM Personal WHERE PersonalID='" + perBanDDL.SelectedItem.Value + "'";

            //defining ADO.NET objects.
            SqlConnection conE1 = new SqlConnection(adminCon);
            SqlCommand cmdE1 = new SqlCommand(perBanSelectSql, conE1);
            SqlDataReader readerE1;


            try
            {
                conE1.Open();
                readerE1 = cmdE1.ExecuteReader();
                readerE1.Read();

                //Filling text box with email

                banEmailTB.Text = readerE1["PersonalEmail"].ToString();

                readerE1.Close();

                //Cannot find the problem in this method, but does not print email into textbox. No errors in Error list.

            }
            catch (Exception err)
            {
                perBanTxtLabel.Text = "Error getting Email";
                perBanTxtLabel.Text += err.Message;
            }
            finally
            {
                conE1.Close();
            }

        }

Posted 22-Apr-14 23:09pm

Coder-Ferg

Updated 22-Apr-14 23:44pm

Herman<T>.Instance

v2

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Herman<T>.Instance 23-Apr-14 5:45am

while (readerE1.Read())

DamithSL 23-Apr-14 5:56am

what is the column type of PersonalID?

Coder-Ferg 23-Apr-14 14:03pm

The column type is varchar(7)

2 solutions

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Brahmmam · Answer 1 · 2014-04-22T23:44:00

If your query returning only one row it is better to use ExecuteScalar() than Executereader()

Try With Folowing code

C#

SqlConnection conE1 = new SqlConnection(adminCon);
SqlCommand cmdE1 = new SqlCommand(perBanSelectSql, conE1);

try
{
conE1.Open();
banEmailTB.Text=cmdE1.ExecuteScalar().ToString();
}
catch (Exception err)
{
perBanTxtLabel.Text = "Error getting Email";
perBanTxtLabel.Text += err.Message;
}
finally
{
conE1.Close();
}

DamithSL · Answer 2 · 2014-04-23T00:11:00

Solution 2

int id = Convert.ToInt32(perBanDDL.SelectedItem.Value);<br />
string perBanSelectSql="SELECT PersonalEmail FROM Personal WHERE PersonalID=@PersonalID";<br />
SqlCommand cmdE1 = new SqlCommand(perBanSelectSql, conE1);    cmdE1.Parameters.AddWithValue("@PersonalID", id);

Posted 23-Apr-14 0:11am

DamithSL