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Developer Forum » Software Engineering and Information Technology » C# » How to allow a user to type a new value into a DataGridView ComboBox

How to allow a user to type a new value into a DataGridView ComboBox Options · View
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hong
Posted: Saturday, August 06, 2011 8:24:38 AM

Rank: Administration
Groups: Administration

Joined: 11/23/2008
Posts: 335
Points: 711
Location: Australia
AS mentioned in How to Create Editable ComboBox in DataGridView, there is no property to enable this for a DataGridView ComboBox. You need to handle the EditingControlShowing event in order to change the DropDownStyle of the ComboBox control to DropDown. Then in the CellValidating event, add the FormattedValue value to the ComboBox list if it doesn't already exist. Note that this method only works when when the DataSource property is not set. Otherwise it will fire the exception"Items collection cannot be modified when the DataSource property is set."

Code:
        private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            if (e.Control.GetType() == typeof(DataGridViewComboBoxEditingControl))
            {
                DataGridViewComboBoxEditingControl combo = e.Control as DataGridViewComboBoxEditingControl;
                combo.DropDownStyle = ComboBoxStyle.DropDown;
                combo.TextChanged += new EventHandler(combo_TextChanged);
            }
        }



Code:
        void combo _TextChanged(object sender, EventArgs e)
        {
            this.dataGridView1.NotifyCurrentCellDirty(true);
        }



Code:
        private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
        {
            if (e.ColumnIndex == myColumn.Index)
            {
                object eFormattedValue = e.FormattedValue;
                if (!myColumn.Items.Contains(eFormattedValue))
                {
                    myColumn.Items.Add(eFormattedValue);
                }
            }
       }
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Sponsor
Posted: Saturday, August 06, 2011 8:24:38 AM
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rinomasari
Posted: Saturday, April 21, 2012 4:25:20 AM
Rank: Newbie
Groups: Member

Joined: 4/21/2012
Posts: 1
Points: 3
follow the link it will explain how datagridview

http://csharp.net-informations.com/datagridview/csharp-datagridview-tutorial.htm

masari.
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Developer Forum » Software Engineering and Information Technology » C# » How to allow a user to type a new value into a DataGridView ComboBox


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