void inputexcle()        {            string msg = string.Empty;            try            {                var ofd = new OpenFileDialog()                {                    Filter = "Microsoft Office Excel 工作簿(*.xls)|*.xls",                    Multiselect = false                };                if (ofd.ShowDialog() == DialogResult.Cancel) return;                this.btintable.Text = ofd.FileName;                dtexcle.Clear();                dtexclebk.Clear();                dtexcle =dtexclebk= BinData.InputExcel(ofd.FileName, ref msg);                this.repositoryItemComboBox1.Items.Clear();                foreach (DataColumn cl in dtexcle.Columns)                {                    this.repositoryItemComboBox1.Items.AddRange(new object[] {          cl.ColumnName.ToString(),});                }                this.repositoryItemComboBox1.Items.AddRange(new object[] {          "",});            }            catch            {                MessageBox.Show(msg);            }        }

repositoryItemComboBox1是gridview中一个combox控件。