Set Value of ComboBoxColumn DataGridView

Question

i have a question. I have a ComboBoxColumn and want to populate Data from Database via ComboBox Variable inside this Column . How can i achieve this.

This snippet I tried doesnt doesn't work

ComboBoxColumn.Items.AddRange("One", "Two", "Three", "Four");

My problem is i getting Data inside another function that will save all the values inside a ComboBox Variable (that every Functions has Access to) and i want to fill the Cell in DataGridView via Column-/Row-Index like this:

private ComboBox ComboBoxItems

private void datagridview_CellClick(object sender, DataGridViewCellEventArgs e)
{
    try
    {
        int col1 = datagridview.Columns["datagridview_col1"].Index;
        int col2 = datagridview.Columns["datagridview_col2"].Index;
        int col3 = datagridview.Columns["datagridview_col2"].Index;

        if ((e.ColumnIndex == col1))
        {

            fill_col2();
        }
        else if ((e.ColumnIndex == col2))
        {
            datagridview.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = ComboBoxItems1;

            foreach (var item in ComboBoxItems1.Items)
            {
                Console.WriteLine(ComboBoxItems1.Items.Count);
                Console.WriteLine(item.ToString());
            }

            if (!String.IsNullOrEmpty(section))
            {
                fill_col3();
            }
        }
        else if ((e.ColumnIndex == col3))
        {
            datagridview.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = ComboBoxItems2;
        }

    }
    catch (Exception ex)
    {
        MessageBox.Show("Error loading Data!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
    }
}

Has anyone an idea for a good working solution?

Answer 1

If you want to set the ComboboxColumn datasource, you can set it while you define the ComboboxColumn.

var ComboCol= new DataGridViewComboBoxColumn
{
    HeaderText = "ComboCol",
    Name = "ComboCol",
    DataSource = new List<string> {"One", "Two", "Three", "Four"}
};

Then before fill the combobox with the data from database, you need to convert the cell to DataGridViewComboBoxCell first.

DataSet ds;
string connetionString = @"Connection String";
using (SqlConnection conn = new SqlConnection(connetionString))
{
    SqlDataAdapter sda = new SqlDataAdapter("Select * From TestTable", conn);
    ds = new DataSet();
    sda.Fill(ds, "TableName");
}

DataGridViewComboBoxCell ComboCell;

foreach (DataRow row in ds.Tables[0].Rows)
{
    int index = dataGridView1.Rows.Add();
    dataGridView1.Rows[index].Cells["CommonCol1"].Value = row[0];

    ComboCell= (DataGridViewComboBoxCell)(dataGridView1.Rows[index].Cells["ComboCol"]);
    ComboCell.Value = row[1].ToString();
}

Hope this can help you.