private void btnNuevo_Click(object sender, EventArgs e)
        {
            FormularioMaterial fMaterial = new FormularioMaterial();

            fMaterial._ConductorId = _ConductorId;
            fMaterial.ShowDialog();
            MaterialGridView.Rows.Clear();
            RetrieveData();
        }
        private void MaterialGridView_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            DataGridViewRow selectedRow = MaterialGridView.Rows[e.RowIndex];

            Material material = new Material();


            material.materialId        = Convert.ToInt16(selectedRow.Cells[0].Value);
            material.conductorId       = _ConductorId;
            material.Descripcion       = Convert.ToString(selectedRow.Cells[1].Value);
            material.fechaDeEntrega    = Convert.ToDateTime(selectedRow.Cells[2].Value);
            material.fechaDeDevolucion = Convert.ToDateTime(selectedRow.Cells[3].Value);

            FormularioMaterial fMaterial = new FormularioMaterial();

            fMaterial._material = material;
            fMaterial.ShowDialog();
            MaterialGridView.Rows.Clear();
            RetrieveData();
        }