在DataGridView中设置ComboBox的默认选定值

Question

My Form consist of a DataGridView and, inside of that, I have one Column as ComboBox.
The ComboBox is getting filled by the database query.

I wanted to display the default value of ComboBox in the DataGridView. I have loaded values in combo box but could not find a way to set a default value for that.

I have added values to a combo box with the following code on the click of the btnLoadCombo button:

private void btnLoadCombo_Click(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["InventoryManagerConnectionString"].ConnectionString);

    //Filling ComboBoxes
    con.Open();
    SqlCommand cmdGetRootCat = new SqlCommand("SELECT * FROM tblProductCategories", con);

    SqlDataReader sdaRootCat = cmdGetRootCat.ExecuteReader();
    comboBoxCatTest.Items.Clear();

    while (sdaRootCat.Read())
    {
        this.CatCombo.Items.Add(sdaRootCat["Cat_Name"]);
    }

    //Filling DataGridView
    DataTable dt = new DataTable();
    dt.Clear();
    SqlCommand cmd = new SqlCommand("SELECT Cat_ID, Cat_Name FROM tblProductCategories", con);

    SqlDataReader sda = cmd.ExecuteReader();
    dt.Load(sda);
    dataGridCatList.DataSource = dt;
    con.Close();            
 }

I expect results as shown in image 2.

Answer 1

You can use

foreach(DataGridViewRow row in dataGridCatList.Rows)
{
    if(row.Cells[3].Value != null) //ignore last row which is empty
    {
        if( row.Cells[3].Value.Equals(1018) )
            row.Cells[0].Value = this.CatCombo.Items[0];
    }
    //...and so on
}

You are going through every row with the foreach() loop and compare the value of Cat_ParentCat with row.Cells[3].Value.Equals(Cat_ParentCatValue) . If a match is found, set the default value of the ComboBox with row.Cells[0].Value = this.CatCombo.Items[yourDefaultValue];