How Do I Insert Into A Databinded Combo Box

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How do i insert new row into index zero of a databinded combo box, here is my code, but it doesn't seem to work.

C#

using ( SqlCommand command = new SqlCommand( "Select firstname from base_user_details", strCon ) )
                    {
                        command.CommandType = CommandType.Text;
                        //command.Parameters.Add( "@SelectOption", SqlDbType.VarChar, 25 ).Value = "staffFirstname";
                        //command.Parameters.Add( "@firstname", SqlDbType.VarChar, 50 ).Value = txtSearch.Text.Trim( );
                        using ( SqlDataAdapter adapter = new SqlDataAdapter( command ) )
                        {
                            using ( dt = new DataSet( ) )
                            {
                                adapter.Fill( dt );
                                cboSchools.DataSource = dt.Tables[0];
                                cboSchools.ValueMember="firstname";
                                cboSchools.DisplayMember ="firstname";
                                
                                cboSchools.Items.Insert( 0, "  ---Select---" );
                            }
                        }
                    }

Posted 7-May-14 22:03pm

Uwakpeter

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3 solutions

Solution 1

first create one class like

C#

public class ComboboxItem
{
    public string Text { get; set; }
    public object Value { get; set; }

    public override string ToString()
    {
        return Text;
    }
}

add code to use this class where you want to add item

C#

ComboboxItem item = new ComboboxItem();
item.Text = "Item text1";
item.Value = 12;
comboBox1.Items.Insert(0,item);

Posted 7-May-14 22:21pm

Darshan.Pa

Updated 7-May-14 22:22pm

Comments

Uwakpeter 8-May-14 5:08am

Please what is the value of 12 for?

Laiju k 8-May-14 5:57am

combo box contains two values

text usually for displaying
value for saving into database

Solution 2

Try like this :

C#

using ( dt = new DataSet( ) )
                            {
                                adapter.Fill( dt );
                                cboSchools.DataSource = dt.Tables[0];
                                cboSchools.ValueMember="firstname";
                                cboSchools.DisplayMember ="firstname";
                                
                                cboSchools.Items.Add("---Select---",0 );
                            }

Posted 7-May-14 22:29pm

syed shanu

Updated 7-May-14 22:32pm

v2

Comments

Uwakpeter 8-May-14 5:07am

Items.Add accepts only one argument

syed shanu 8-May-14 5:23am

Yes try like this :
cboSchools.Items.Add("---Select---");
cboSchools.Items.Add(new Item("--Select--", 0));

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DamithSL · Accepted Answer · 2014-05-07T22:36:00

Solution 3

do as below, before set the data source add row to datatable

C#

adapter.Fill(dt);
DataRow row = dt.Tables[0].NewRow();
row.ItemArray = new object[] { "--select--");
dt.Tables[0].Rows.InsertAt(row, 0);
cboSchools.DataSource = dt.Tables[0];
cboSchools.ValueMember="firstname";
cboSchools.DisplayMember ="firstname";

Posted 7-May-14 22:36pm

DamithSL

Updated 7-May-14 23:33pm

v2

Comments

Uwakpeter 8-May-14 5:12am

its reporting error on dt.NewRow() and dt.Rows, there is no intellisence

DamithSL 8-May-14 5:34am

oh, sorry, check my update

Uwakpeter 8-May-14 6:01am

it works, thanks.