当用户类型时，无法设置组合所选索引

我有一个带有数据绑定组合框的表单，将dropstyle设置为下拉，因此用户可以在组合框中输入。

我的问题是，当用户键入组合框和值类型匹配绑定到组合框的值之一，它不会改变selecteindex，即使我已经尝试过了。相反，它将所选索引设置为-1(因此所选值为null)。

有人能帮忙吗?这是我的代码(我的一个尝试，我尝试了其他方法，但没有帮助)。

private void setCombo()
{
        comboFromOther.DisplayMember = "tbl10_KupaID";
        comboFromOther.ValueMember = "tbl10_KupaID";
        comboFromOther.DataSource = dsKupotGemel.Tables[0];
}
private void comboToOther_TextChanged(object sender, EventArgs e)
{
        comboDetail = changedComboText(2, comboToOther.Text);
        textToOther.Text = comboDetail[0];
        if (comboDetail[0] == "")
        {
        }
        else
        {
            comboToOther.SelectedIndex = System.Int32.Parse(comboDetail[1]);
            comboToOther.SelectedValue = System.Int32.Parse(comboDetail[2]);
        } 
    }
    private string[] changedComboText(int iComboType, string comboString)
    {
        if (groupCalculate.Visible == true)
        {
            groupCalculate.Visible = false;
        }
        string[] kupaDetail = new string[3];
        kupaDetail[0] = "";
        kupaDetail[1] = "";
        kupaDetail[2] = "";
        for (int i = 0; i <= dsKupotGemel.Tables[0].Rows.Count - 1; i++)
        {
           if (comboString == dsKupotGemel.Tables[0].Rows[i][0].ToString())
           {
                 kupaDetail[0] = dsKupotGemel.Tables[0].Rows[i][1].ToString();
                 kupaDetail[1] = i.ToString();
                 kupaDetail[2] = comboString;
                 break;
           }
           else
           {
           }
        }
   return kupaDetail;
}

// Fields
private const string NameColumn = "Name";
private const string IdColumn = "ID";
private DataTable table;

// Data source
table = new DataTable("SomeTable");
table.Columns.Add(NameColumn, typeof(string));
table.Columns.Add(IdColumn, typeof(int));
table.Rows.Add("First", 1);
table.Rows.Add("Second", 2);
table.Rows.Add("Third", 3);
table.Rows.Add("Last", 4);
// Combo box:
this.comboBox1.DisplayMember = NameColumn;
this.comboBox1.ValueMember = IdColumn;
this.comboBox1.DataSource = table;
this.comboBox1.DropDownStyle = ComboBoxStyle.DropDown;
this.comboBox1.TextChanged += comboBox1_TextChanged;
this.comboBox1.SelectedIndexChanged += this.comboBox1_SelectedIndexChanged;

private void comboBox1_TextChanged(object sender, EventArgs e)
{
    for (int i = 0; i < table.Rows.Count; i++)
    {
        if (table.Rows[i][NameColumn].ToString() == this.comboBox1.Text)
        {
            this.comboBox1.SelectedValue = table.Rows[i][IdColumn];
            break;
        }
    }
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    // Do here what is required
}