How to change the column width of a gridview programatically through code behind

How to change the column width of a gridview programatically through code behind. I have a gridview control on a aspx page and am adding all columns including the update/delete buttons in the code behind. I have also added the code for changing the column width in the GridView1_RowDataBound event but it is not working as desired. The text columns are working but the other columns are contracted. Attached is the code below, please help what is not correct here?

protected int widestData=0;
 
private void AddGridViewColumns()
        {
            this.GridView1.Columns.Clear();
            this.GridView1.AutoGenerateColumns = false;
            switch (_pageMode)
            {
 
                case "ReleasedParts":
                    this.GridView1.AllowPaging = false;
                    this.GridView1.PageSize = 5;
                    this.GridView1.DataKeyNames = new string[] { "PartID" };
                    this.GridView1.Columns.Add(new BoundField() { DataField = "PartID", HeaderText = "PartID", Visible = false });
                    AddEditAndDeleteButtons();
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Part Number", HeaderText = "Part Number"});
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Hardware PN", HeaderText = "Hardware PN" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Hardware PN2", HeaderText = "Hardware PN2" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Hardware PN3", HeaderText = "Hardware PN3" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Hardware PN4", HeaderText = "Hardware PN4" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Docs", HeaderText = "Docs" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "ACC Description", HeaderText = "ACC Description" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "ECN ", HeaderText = "ECN" });
                    this.GridView1.Columns.Add(new BoundField() { DataField = "Release Date", HeaderText = "Release Date" });
                    DeleteBtnIndex = GridView1.Columns.Count - 1;
 
                    break;
                              
            }
        }
 
 
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            widestData = 0;
            System.Data.DataRowView drv;
            drv = (System.Data.DataRowView)e.Row.DataItem;
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (drv != null)
                {
                    switch (_pageMode)
                    {
 
                        case "ReleasedParts":
                            String catName = drv[1].ToString();
 
                            int catNameLen = catName.Length;
                            if (catNameLen > widestData)
                            {
                                widestData = catNameLen;
                                GridView1.Columns[1].ItemStyle.Width = widestData * 1;
                                GridView1.Columns[1].ItemStyle.Wrap = false;
                                GridView1.Columns[2].ItemStyle.Width = widestData * 1;
                                GridView1.Columns[2].ItemStyle.Wrap = false;
                                GridView1.Columns[3].ItemStyle.Width = widestData * 8;
                                GridView1.Columns[3].ItemStyle.Wrap = false;
                                GridView1.Columns[4].ItemStyle.Width = widestData * 8;
                                GridView1.Columns[5].ItemStyle.Wrap = false;
                                GridView1.Columns[6].ItemStyle.Width = widestData * 8;
                                GridView1.Columns[7].ItemStyle.Wrap = false;
                            }
 
                            break;
                    }
 
 
 
                }
                
            }
 
private void AddEditAndDeleteButtons()
        {
 
            this.GridView1.Columns.Add(new CommandField() { HeaderText = "", ShowEditButton = true, EditText = "Edit", UpdateText = "Save", CancelText = "Cancel" });
            this.GridView1.Columns.Add(new CommandField() { HeaderText = "", ShowDeleteButton = true });
            DeleteBtnIndex = GridView1.Columns.Count - 1;
        }

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