how to change column type of datagridview in VB.NET

datagridview1.Columns.Clear();
datagridview1.AutoGenerateColumns = false;
dgvMappedfields.Columns.AddRange
                (
                    new DataGridViewTextBoxColumn
                    {
                        DataPropertyName = "DataPropertyName1",
                        Name = "Name1",
                        HeaderText = "HeaderText1"
                    },
                    new DataGridViewButtonColumn
                    {
                        DataPropertyName = "DataPropertyName2",
                        Name = "Name2",
                        HeaderText = "HeaderText2"
                    }
                );