How to Auto populate a text box when selecting a value from Dropdownlist (Asp.net C#)

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How to Auto populate a text box when selecting a value from Dropdownlist (Asp.net C#)
(Iam following layered structure)

simply say that ,iam selecting a value from dropdownlist...its
ddlVndrName.DataSource = objVndrList;
ddlVndrrName.DataValueField = "VndrID";
ddlVndrName.DataTextField = "VndrName";
ddlVndrName.DataBind();
How to populate a textbox with PhoneNumber corresponds to the above VndrID in db

Posted 20-Apr-14 19:33pm

MAGuru

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Chaitanya Pai · Answer 1 · 2014-04-20T21:04:00

Solution 1

Hi,

Set AutoPostback property as True of the DropDownList and write code to fetch phonenumber in DropDownList1_SelectedIndexChanged event.

Posted 20-Apr-14 21:04pm

Chaitanya Pai

Comments

MAGuru 21-Apr-14 3:25am

But Iam using 3tier architecture

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2014-04-20T23:17:00

Solution 2

Quote:
But Iam using 3tier architecture

Then write a method in each tier and try to pass parameter from one tier to other and fetch the data.

Posted 20-Apr-14 23:17pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

MAGuru 21-Apr-14 5:56am

Please give sample code

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Apr-14 6:02am

No, I can't and we don't provide samples here. Please try to do it yourself. If you face any particular issue while implementing, then come back and add another question.

This is very easy. Just a matter of adding methods in each tier and calling it.

Md.Ashiquzzaman · Answer 3 · 2014-04-21T07:06:00

If you want to populate from database and have a data filed like PhoneNumber then. simple

XML

<asp:DropDownList ID="ddlVndrName" runat="server" AutoPostBack="True" onselectedindexchanged="ddlVndrName_SelectedIndexChanged/>"

Then code behind

C#

protected void ddlVndrName_SelectedIndexChanged(object sender, EventArgs e)
{
  string selectedValue = ddlVndrName.SelectedValue.Tostring();


  TextBox1.Text = GetData( selectedValue);

}

public string GetData(string id)
{
var ConnectionString= "your connection string";
var query = string.formet( SELECT PhoneNumber FROM tableName WHERE id ={0},id};
 using (var conn = new SqlConnection(ConnectionString))
          {
              try
              {
                  if (conn.State == ConnectionState.Closed)
                  {
                      conn.Open();
                  }

                  string returnValue = string.Empty;
                  var selectCommand = new SqlCommand(query, conn);

                      var myReader = selectCommand.ExecuteReader();
                      while (myReader.Read())
                      {
                          returnValue = myReader.GetString(0);
                      }

                  if (conn.State == ConnectionState.Open)
                  {
                      conn.Close();
                  }
                  return returnValue;
              }
          }
          catch (Exception e)
          {
             throw new Exception(e.Message);
          }

}